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topic: Oceans And Climate Change
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Ongoing global coral bleaching event affects 84% of world’s reefs
Coral reefs around the world have been subjected to unprecedented heat stress since early 2023. A new report finds heat-related coral bleaching has damaged corals in more than 80 countries, making it the most extensive bleaching event ever recorded, with no clear end in sight. Between January 2023 and April 2025, heat stress impacted 84% […]
Critically endangered right whales spotted in the Bahamas for first time
Two North Atlantic right whales, among the most at-risk marine mammals, were spotted swimming in the Bahamas on April 15, marking the first time the species has been seen in the nation’s waters. “That moment for me was breathtaking, and I couldn’t fully gather myself. I thought it was fake at first,” Isaac Ellis, a […]
Corals recover faster on artificial structures than on natural reefs, study finds
As climate change causes ocean temperatures to rise, coral bleaching events are expected to become more frequent. So, scientists are looking for ways to help coral reefs recover more quickly, and a new study from Japan suggests that artificial structures like breakwaters may be helpful. When oceans become excessively warm, corals can expel the symbiotic […]
In Panama, Indigenous Guna prepare for climate exodus from a second island home
- The island of Uggubseni, located in Panama’s Guna Yala provincial-level Indigenous region, spent the month of February participating in region-wide celebrations to mark the centenary of a revolution in which the Indigenous Guna expelled repressive Panamanian authorities and established their autonomy in the region.
- Though the intervening century has left the Guna’s fierce independence undimmed, new existential threats now face Uggubseni: Accelerating sea level rise due to human-caused climate change and overpopulation.
- A consensus now exists among Uggubseni residents that moving inland is necessary; but it remains unclear whether the government will be able to deliver the necessary funding and support.
- Although 63 communities nationwide are at risk of sinking due to climate change, there’s only one other model for climate relocation: In June 2024 the Panamanian government relocated around 300 families from Gardi Sugdub, another island in Guna Yala, to a new community on the mainland where problems remain rife.
Melting Antarctic ice could weaken world’s strongest ocean current, study warns
The strongest ocean current on Earth circles Antarctica. It’s the primary way water moves between the Atlantic, Pacific and Indian oceans, and helps regulate the global climate. But a new study suggests the Antarctic Circumpolar Current (ACC), which until now has been extremely stable, might begin to slow down in the next 25 years, with […]
Study delves into increase in humpback whale sightings in UK and Ireland
Earlier this year, U.K. media reported an increase in humpback whale sightings in British and Irish waters. Between December 2024 and January, The Guardian reported some 17 sightings of humpback whales (Megaptera novaeangliae) from the Isles of Scilly in southwest England. Meanwhile, the nonprofit Sussex Dolphin Project reported more than 50 sightings from Sussex in […]
In Pakistan, sea level rise & displacement follow fisherfolk wherever they go
- Rising sea levels are displacing fisherfolk in Pakistan’s coastal areas, forcing them to move to higher ground, such as Karachi, where they now face saltwater intrusion and other climate impacts.
- For many, this displacement is not just about losing homes, but also cultural heritage, traditions and livelihoods, with women, in particular, losing economic freedom as fishing communities decline.
- The Pakistani government lacks a formal policy for the voluntary migration of climate refugees, and while efforts like mangrove restoration have been attempted, they have not significantly alleviated the fishing community’s problems.
- Karachi is projected to receive 2.3 million climate migrants by 2050, primarily due to rising sea levels, saltwater intrusion, and other climate-related catastrophes.
With climate change, cryosphere melt scales up as a threat to planetary health
- Earth’s cryosphere — comprised of ice sheets, glaciers, permafrost and snowfall — is in a rapid state of flux due to escalating climate change, with numerous studies underlining the grave risks posed by the thaw.
- Today, that worldwide meltdown poses new threats to human lives — endangering freshwater supplies and food security while increasing the risks of natural disasters and disease outbreaks. Cryosphere loss poses immense dangers to the environment, agriculture, economy and society according to a new report.
- If emissions continue unabated, these problems will only worsen. Scientists warn of compounding risks as cryosphere melt escalates, including sea level rise, the slowing of ocean currents, and the triggering of feedbacks that will add to climate change.
- 2025 is designated the International Year of Glaciers’ Preservation. Experts are calling for drastic cuts to carbon emissions because each fraction of a degree of warming avoided counts toward the preservation of the cryosphere along with the ecosystem services that ice, snow and permafrost provide.
Scientists identify more than 800 new species in global Ocean Census
The Ocean Census project has identified 866 new marine species, many from the deep seas, less than two years since its launch. The project announced its findings on March 10, marking the first phase of its goal to document 100,000 new species in the Earth’s oceans. “The ocean covers 71% of our planet, yet only […]
From Kenya to Madagascar, massive effort aims to put seagrasses on the map
In 2019, scientists set out to map the extent of seagrass in Seychelles, an island nation off the eastern coast of Africa. There, they hit upon a startling number: More than 90% of the country’s “blue carbon,” or the carbon stored in marine ecosystems, is contained within seagrass meadows. Under the Large-scale Seagrass Mapping and […]
Study suggests algal blooms disorient whales, putting them in danger
- Harmful algal blooms (HABs) in the ocean produce toxins that can sicken humans and marine animals.
- A new study has found an increase in large-whale deaths and injuries near HABs on the U.S. East and West Coasts, mainly due to ship strikes and entanglement in fishing gear.
- The authors propose the reason may be that HAB toxins disorient whales, decreasing their ability to avoid ships and fishing gear. However, they say more research is needed to confirm the link.
- They recommend using advanced HAB prediction models to reduce whale deaths by limiting activities like fishing when HABs and whales overlap.
Marshall Islands protects ‘pristine’ Pacific corals with first marine sanctuary
The Marshall Islands government has announced it will protect an area of the Pacific Ocean described as one of the most “remote, pristine” marine ecosystems on Earth. The 48,000-square-kilometer (18,500-square-mile) marine sanctuary covers two of the country’s northernmost uninhabited atolls, Bikar and Bokak, and the surrounding deep sea, and it is the first federal marine […]
2024’s top ocean news stories (commentary)
- Marine scientists and policy experts from nine international research and conservation institutions share their list of the top ocean news stories from 2024.
- Hopeful developments this past year include advancing innovations in mapping technologies, legal strategies and financial instruments to protect the ocean and greater inclusion of Indigenous peoples and coastal communities into high-level ocean planning.
- At the same time, 2024 was the hottest year on record as a result of climate change, surpassing 2023, and scientists declared the fourth global coral bleaching event, a major setback for the world’s coral reef ecosystems.
- This post is a commentary. The views expressed are those of the authors, not necessarily Mongabay.
Atlantic puffins are perilously attracted to artificial light, new study shows
- When they make their first journey into the ocean, fledgling Atlantic puffins are prone to being stranded on land, imperiling them. For years, scientists have wondered what leads to these strandings.
- A new study provides experimental evidence to show that artificial light lures young puffins toward land, contributing to strandings.
- The study found pufflings don’t have a strong preference for any particular light source or color. However, once stranded, they move more under darkness and high-pressure sodium lights than under LED lights.
- Reducing artificial lights along the coast and offshore could save puffin lives, say conservationists, as Atlantic puffin populations are decreasing in parts of Europe. It can also save other threatened seabirds, such as Leach’s storm petrel found off Canada’s coast.
Climate change forces Jakarta fishing families to marry off young daughters
Climate change is driving families on Indonesia’s northern Javanese coast toward child marriage as a survival strategy amid dwindling fish stocks and increasing economic hardships, two Mongabay reports show. Mongabay contributor Maulia Inka Vira Fendilla traveled to North Jakarta’s Kalibaru neighborhood in 2023 and met Janah and Jaroh, sisters who were both married off at […]
Electrochemical removal of ocean CO2 offers potential — and concerns
- Stripping seawater of carbon dioxide via electrochemical processes — thereby prompting oceans to draw down more greenhouse gas from the atmosphere — is a geoengineering approach under consideration for largescale CO2 removal. Several startups and existing companies are planning projects at various scales.
- Once removed from seawater, captured carbon dioxide can be stored geologically or used commercially by industry. Another electrochemical method returns alkaline seawater to the oceans, causing increased carbon dioxide absorption over time.
- In theory, these techniques could aid in carbon emission storage. But experts warn that as some companies rush to commercialize the tech and sell carbon credits, significant knowledge gaps remain, with potential ecological harm needing to be determined.
- Achieving the scale required to make a dent in climate change would require deploying huge numbers of electrochemical plants globally — a costly and environmentally risky scenario deemed unfeasible by some. One problem: the harm posed by scale-up isn’t easy to assess with modeling and small-scale projects.
Balochistan’s Gwadar city sits at the crossroads of climate and conflict
- A new study examines the links between conflict and climate in Pakistan’s Balochistan province, where extreme weather can be a threat multiplier.
- The port city of Gwadar serves as an example, as local residents have long had grievances against the state, which were exacerbated by recent flooding that killed several people and displaced hundreds.
- Experts highlight the absence of data-driven policies, citing a gap in research that has hindered solutions; they call for investment in data and the inclusion of local people in decision-making and infrastructure planning.
Scientists in Bali find what could be the world’s largest coral colony
When a massive coral colony was recently discovered in the Solomon Islands, it was believed to be the largest in the world. Then last week, scientists found an even bigger one in the waters off the Indonesian island of Bali. Coral restoration nonprofit Ocean Gardener announced that Indonesian marine biologists had measured a Galaxea astreata […]
After historic 2024 coral bleaching, hope remains for Mesoamerican Reef
- The Mesoamerican Reef, the longest barrier reef in the Western Hemisphere, stretches 1,000 kilometers (620 miles) along the Caribbean coasts of Mexico, Belize, Guatemala and Honduras.
- The latest instalment of the Mesoamerican Reef Report Card, a periodic health assessment, finds that in 2024, the worst coral bleaching event on record reduced the reef’s coral cover.
- Although the overall health of the Mesoamerican Reef remains “poor,” according to the report, its health actually improved for the first time in five years.
- The report attributes this positive development to an increase in fish populations due to effective enforcement of fisheries rules by regional authorities.
Killer whales have found new homes in the Arctic Ocean, potentially reshaping marine ecology
- The vast ice sheets that historically kept killer whales out of the Arctic Ocean are melting as the region rapidly warms.
- Two small, genetically distinct groups of killer whales now live in the Arctic, after migrating from more southern regions of the Atlantic Ocean.
- Killer whales put pressure on the local ecosystem, including Arctic whales important to Indigenous groups.
44% of reef-building coral species at risk of extinction: IUCN
Some 44% of the world’s warm-water, reef-building coral species are facing risk of extinction, according to the latest update by the IUCN Red List of Threatened Species. This is a significant increase compared to the last assessment in 2008, when a third were considered threatened. The latest assessment covers all known coral species that build […]
NOAA finds 77% of world’s corals exposed to bleaching-level heat
In 2023, more than three-quarters of the world’s coral reefs were exposed to ocean temperatures that can cause coral bleaching, researchers with the U.S. National Oceanic and Atmospheric Administration (NOAA) report. Roughly 90% of the excess heat from anthropogenic climate change is absorbed by the oceans, making them hotter now than at any point in […]
UN falls short on coral funding as reefs face largest bleaching event on record
A United Nations emergency session on coral reefs came up short, with funding commitments well below what is needed to protect critical marine ecosystems. The Oct. 30 meeting held at COP16, the U.N. biodiversity summit, in Colombia, was underscored by recent data that show more than three-quarters of the world’s coral reefs are under threat […]
More krill fishing and no new protected areas for Antarctic seas after latest talks
- The Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR) held its annual meeting Oct. 14-25 in Hobart, Australia.
- The international body comprised of 27 members is charged with conserving marine life in Antarctic waters, an area that is changing rapidly due to human-caused climate change.
- In 2009, the CCAMLR pledged to create “a representative network” of marine protected areas in the Southern Ocean, yet negotiations over four proposed MPAs have been at a standstill for years, due to repeated vetoes by the Chinese and Russian delegations.
- Despite a year of interim negotiations, CCAMLR members failed again at the latest meeting to reach agreement on creating any new marine protected areas and rolled back regulation of the burgeoning Antarctic krill fishery.
Protecting coral reefs boosts fish numbers by 10%: Study
- New research has found that the protection of coral reefs has boosted the amount of fish they harbor by around 10%.
- The study used survey data from about 2,600 reefs with varying levels of protection from overfishing.
- The team then built a statistical model to predict what would have happened if all reefs had not been protected, and the biomass, or collective weight of the resident fish, dropped by more than 10%.
- The scientists note their findings demonstrate that protections like marine protected areas are working and that greater coverage could lead to even more gains in fish biomass.
Coastal farmers in Bangladesh give up shrimp farming for agriculture to combat salinity
- The decades-long shrimp aquaculture on Bangladesh’s southwest coast, which negatively impacts the environment in many ways, including creating a freshwater crisis, is now losing its importance as the farmers are gradually inclining toward agriculture again.
- Increased salinity, both due to sea-level rise and diversion of the upstream flow of freshwater, and peer pressure had forced the coastal farmers to venture into shrimp cultivation about four decades ago.
- For the last couple of years, excessive salinity and repeated viral outbreaks in shrimp farms have pushed the farmers back to agro-based farming again.
- Crop diversification plays a positive role in addressing the changes; however, water shortage poses a big challenge in restoring agriculture.
A future where we might ‘get climate right’: A conversation with Ayana Elizabeth Johnson
Solving our ecological and climate problems looks a lot less like a techno-utopia and more like a mosaic of actions both to protect and restore nature, and to increase and safeguard human equity in the face of climate change, marine biologist Ayana Elizabeth Johnson says on Mongabay’s latest podcast episode. In other words, flashy technology, […]
Inaugural Planetary Health Check finds ocean acidification on the brink
- A first of its kind Planetary Health Check by an international team of scientists indicates that six of nine planetary boundaries are not only transgressed, but are moving further into zones of risk. In addition, recent research shows that a seventh boundary, ocean acidification, is on the verge of transgression.
- Intensifying ocean acidification spells problems for marine life, fisheries and economies. Based on current human CO₂ emission trajectories, this boundary may be breached in a few years, say experts. Others argue this threshold may already have been crossed, with regional acidification above safe limits.
- Together, the nine planetary boundaries identify limits within which Earth systems can operate safely to maintain the planet’s habitability. Transgressing boundaries heightens risks of breaching tipping points that would bring about irreversible shifts to the planet, threatening humanity and life as we know it.
- This inaugural Planetary Health Check is the first of yearly scheduled reports on the wellbeing of Earth systems. Annual reports are now needed due to humanity’s rapid crossing of planetary boundaries, and due to the urgency of providing up to date scientific data to policymakers.
Lab-grown corals resisted bleaching during Caribbean’s worst marine heat wave
- In 2023, the Caribbean Sea experienced unprecedented heat: Beginning in March, sea surface temperatures throughout the region ranged from 1°-3°C (1.8°-5.4°F) warmer than normal.
- This unprecedented heat brought the worst coral bleaching event in the Caribbean’s recorded history, bleaching 60-100% of some reefs, and killing many patches.
- A new study found that certain species of coral propagated in the lab and then outplanted to restore reefs in five countries showed few signs of bleaching despite the prolonged marine heat wave, faring better than wild corals or corals propagated from fragments.
As waterbodies lose oxygen, are we breaching a potential planetary boundary?
- A new perspective piece argues that aquatic deoxygenation — the depletion of oxygen in marine and freshwater environments — should be considered its own “boundary” in the planetary boundary framework first proposed by scientists in 2009. Human-caused nitrogen pollution and climate change have greatly worsened aquatic deoxygenation worldwide.
- The planetary boundary framework defines nine natural biophysical and biochemical system processes that maintain the resilience of the Earth system, allowing life to thrive. But each boundary includes limits within which humanity needs to safely operate.
- The paper’s lead author says that increased scientific understanding of dissolved oxygen in marine and freshwater environments shows that it regulates, and is regulated by many of the other planetary processes, which in turn warrants the inclusion of aquatic deoxygenation in the planetary boundary framework.
- The framework is a rapidly evolving theory. Whether aquatic deoxygenation is already indirectly taken into account by the existing framework, as some argue, or whether it should be considered as its own planetary boundary remains to be determined.
Warming is not helping smoother navigation through the Arctic
Over the last 50 years, the Arctic has been warming four times faster than any other place on Earth, causing rapid melting of sea ice. For shipping and trade, this lack of Arctic sea ice could mean a much shorter trade route between the Atlantic and Pacific oceans. Without it ships must go out of […]
In northern Spain, climate change is killing shellfish — and women’s livelihoods
- In Galicia in northwestern Spain, shellfish harvesting is traditionally women’s work.
- But the clams and cockles the shellfish pickers’ livelihoods depend on are increasingly harder to come by.
- Extreme weather events made more frequent and intense by climate change, including heat waves and torrential rain, threaten the four main shellfish species harvested in the region, and with them, the tradition that has been passed down through generations of women.
New approach to restore coral reefs on mass scale kicks off in Hawai‘i
- ʻĀkoʻakoʻa is a recently launched program aiming to restore a 193-kilometer (120-mile) stretch of coral reef along the west coast of Hawai‘i Island — one of the first to attempt restoration at a large scale.
- The project will identify individual corals with high thermal tolerance and other high-performance traits, then use them to breed genetically resilient coral larvae for release onto the reefs during natural spawning periods.
- ʻĀkoʻakoʻa is working with partners to reduce other stressors to the reefs, which can help corals be more resilient to rising sea temperatures, and drawing on Hawaiian traditional values of environmental stewardship.
- If successful, the project could provide knowledge for how to restore ailing reefs around the world suffering from an onslaught of human-driven thermal stress.
Can iron fertilization of the oceans help solve the climate crisis? (commentary)
- In response to climate change, several carbon dioxide removal approaches involving the marine environment are being studied, with ocean iron fertilization being among those with the greatest potential, according to the U.S. National Academies of Sciences.
- The introduction of iron into ocean regions that are iron-limited stimulates the growth of phytoplankton, which play a pivotal role in carbon sequestration, and while critics have long pointed out that such fertilization could cause wide ranging ecological consequences, a number of researchers are pursuing it with new energy.
- “It is important to conduct research and hold public deliberations to explore if iron fertilization could be effectively and safely done, and whether coastal communities and rights holders might actually want it,” a new op-ed argues.
- This post is a commentary. The views expressed are those of the authors, not necessarily Mongabay.
Illegal fishing and land grabs push Cambodian coastal communities to the brink
KOH KONG, Cambodia — Join Mongabay staff writer Gerry Flynn as he embarks on a crucial investigation along Cambodia’s coast, uncovering the effects of illegal fishing and unchecked coastal development on local communities. In recent years, fish stocks in Cambodian waters have plummeted, leading to a dramatic decline in income for small-scale fishers. The primary culprits? […]
Small-scale fishers lose out to trawlers in race to catch Cambodia’s last fish
- On Cambodia’s coast, fish catches have dropped precipitously in recent years, and so have small-scale fishers’ incomes.
- Small-scale fishers say commercial trawlers have been illegally entering their fishing grounds, scraping the sea clean of life and, with it, their community’s ability to survive.
- Although fishers often blame foreign vessels, satellite data show Cambodian-, Thai- and Vietnamese-flagged trawlers making frequent illegal incursions into Cambodia’s protected waters, community fisheries or shallow inshore waters legally reserved for small-scale fishers.
- This is the first part of a Mongabay series about challenges faced by Cambodia’s small-scale fishers along the coast.
As catches fall, Sierra Leone’s artisanal fishers turn to destructive practices
- Sierra Leone’s fish stocks have been under severe strain in recent years due to intensive industrial fishing and a growing population of artisanal fishers, with fishers consistently reporting falling catches.
- This has triggered heightened competition for increasingly scarce yields.
- To secure their livelihoods, artisanal fishers have turned to unsustainable fishing gear, such as undersize-mesh nets, and target fish breeding and nursery grounds, disrupting the fish reproductive cycle.
- The crisis is fueled by the ready availability of illegal nets, weak law enforcement and widespread economic hardship.
Twilight zone fishing: Can we fish the ocean’s mesopelagic layer?
- Fishing experts are looking for ways to fish in the mesopelagic zone, a layer of water that stretches from 200-1,000 meters (660-3,300 feet) beneath the surface, which has, thus far, remained relatively unexploited.
- Many challenges stand in the way of making mesopelagic fishing a reality, such as the difficulties of finding and capturing mesopelagic fish, and processing them into usable products.
- Yet experts are working to overcome these obstacles, with one suggesting that mesopelagic fishing could begin in the next few years.
- Conservation experts have expressed concern about the possible start of mesopelagic fishing, arguing that it could cause environmental problems.
Warming seas push India’s fishers into distant, and more dangerous, waters
- Many of India’s more than 4 million fishers are sailing beyond the country’s exclusive economic zone into the high seas in search of a better catch.
- Rising sea surface temperatures, overfishing near the shore, and the destruction of reefs have decimated nearshore fisheries, forcing India’s fishers farther out to sea where they face greater risk.
- A common danger they run is straying into the waters of another country, which can lead to their boats being seized and the crew being jailed or even killed.
- The Indian government has issued policies to protect and recover nearshore fish stocks, even as it encourages fishing in the high seas.
Panama delays promised relocation of sinking island community
- The government of Panama continues to delay the process of relocating almost 1,300 Indigenous Guna inhabitants from an island experiencing rising sea levels due to climate change.
- The lack of space on the tiny Caribbean island of Gardi Sugdub means there’s no room to relocate, and a new site on the mainland for the community has been in the works since 2019.
- But plans for the relocation have been repeatedly delayed due to administrative issues, previous COVID-19 restrictions and poor budgeting, leaving residents skeptical that government promises will be upheld.
- Members of this fishing community have also expressed concern about the relocation site, which is a 30-minute walk from the coast, and about the design of the new homes, for which the government didn’t seek Guna input.
Global coral bleaching now underway looks set to be largest on record
- Scientists say that coral reefs are currently undergoing a global bleaching event, with more than 54% of the world’s coral reef areas in the territorial waters of over 50 countries experiencing heat stress. According to one scientist, the percentage of areas dealing with bleaching-level heat stress “has been increasing by roughly 1% per week.”
- To assess the current bleaching event, scientists drew on satellite-derived sea surface temperature data and in-water measurements.
- Experts say the current El Niño, a phase in the El Niño–Southern Oscillation (ENSO) climate pattern, in combination with rising global sea temperatures, is responsible for the extensive coral bleaching.
- Mongabay interviewed scientists most familiar with coral reef bleaching data, and experts attending the 9th Our Ocean Conference in Athens, taking place from April 15-17.
Huge new no-fishing zones give Antarctic marine predators and their prey a break
- The government of the South Georgia and South Sandwich Islands (SGSSI), which operates as a British overseas territory, recently announced that it had established new no-fishing zones over 166,000 km² (64,100 mi²) of its existing marine protected area, and prohibited krill fishing in an additional 17,000 km² (6,600 mi²) of the MPA.
- These new no-fishing zones were established to protect krill-dependent marine wildlife, including baleen whales and penguins, while also considering the fisheries operating in the area, which target krill and other species.
- While conservationists initially pushed for further protections, they ultimately accepted the decision, with one calling it a “positive and good outcome.”
- However, Argentina, which claims the South Georgia and South Sandwich Islands as part of its Tierra del Fuego province, has expressed its dissatisfaction with the SGSSI government’s decision.
‘Corals dying’ as yet more bleaching hits heat-stressed Great Barrier Reef
- Both aerial and in-water surveys have shown that the southern section of the Great Barrier Reef is undergoing extensive coral bleaching.
- Surveys have also shown “limited bleaching” in the northern part of the Great Barrier Reef.
- However, scientists and reef managers plan to conduct more air and in-water surveys to further assess the coral bleaching across all parts of the Great Barrier Reef.
- Scientists suspect but have not yet confirmed that a seventh mass bleaching event since 1998 is currently underway; the last mass bleaching event on the Great Barrier Reef happened in 2022.
Summit on migratory species sides with science, throws shade on deep-sea mining
- Representatives from 133 member states of the Convention on the Conservation of Migratory Species of Wild Animals (CMS) met in Samarkand, Uzbekistan, from Feb. 12-17 to discuss measures to protect migratory species on a global scale.
- Many decisions at the meeting, known as COP14, focused on the protection of marine species, including the listing of several species in the convention’s appendices, a draft decision on vessel strikes, and an updated resolution on climate change that urges parties to take measures to protect species from future threats.
- The convention also adopted a resolution urging parties not to engage with or support deep-sea mining until more scientific evidence is acquired. This resolution garnered criticism from the secretary-general of the International Seabed Authority (ISA), the U.N.-mandated body that governs deep-sea mining in international waters.
- While attendees say COP14 had many successes, some experts say that more action and resources are required to keeping species from sliding toward extinction.
The new Arctic: Amid record heat, ecosystems morph and wildlife struggle
- Every species of animal and plant that lives or breeds in the Arctic is experiencing dramatic change. As the polar region warms, species endure extreme weather, shrinking and altered habitat, decreased food availability, and competition from invading southern species.
- A wide array of Arctic organisms that rely on sea ice to feed or breed during some or all of their life cycles are threatened by melt: Over the past 40 years, the Arctic Ocean has lost about 75% of its sea ice volume, as measured at the end of the summer melt season. This translates into a loss of sea ice extent and thickness by half on average.
- Researchers note that the rate of change is accelerating at sea and on land. While species can adapt over time, Arctic ecosystem alterations are too rapid for many animals to adapt, making it difficult to guess which species will prevail, which will perish, and where.
- The only thing that could limit future extinctions, researchers say, is to quickly stop burning fossil fuels, the main driver of climate change.
From exporting coral to restoring reefs, a Madagascar startup rethinks business
- After her father died, Jeimila Donty took over her family’s coral export business and shifted its focus to conservation, creating Koraï.
- Donty is part of a young “pro-climate” generation that’s keen to incorporate the environment into business models.
- Koraï plants corals in Madagascan waters on behalf of other companies as part of their corporate social responsibility (CSR) commitments.
- The business is ambitious and faces challenges, such as recruiting workers and a lack of political support.
Pakistan bucks global trend with 30-year mangrove expansion
- Around the world, mangrove forests have undergone a decades-long decline that is just now slowing to a halt.
- In Pakistan, by contrast, mangroves expanded nearly threefold between 1986 and 2020, according to a 2022 analysis of satellite data.
- Experts attribute this success to massive mangrove planting and conservation, as well as concerted community engagement.
- Many in Pakistan are looking to mangroves to bolster precious fish stocks and defend against the mounting effects of climate change — even as threats to mangroves, such as wood harvesting and camel grazing, continue with no end in sight.
2023’s top ocean news stories (commentary)
- Marine scientists from six international research and conservation institutions share their list of the top ocean news stories from 2023.
- Hopeful developments this past year include a monumental global treaty to protect biodiversity on the high seas and the regulation of international trade in 97 species of sharks and rays under the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES).
- At the same time, 2023 was the hottest year on record, with widespread bleaching of corals in the Caribbean and Great Barrier Reef, and many more hot years forecast as humanity’s emissions of greenhouse gases that cause global warming continue.
- This post is a commentary. The views expressed are those of the authors, not necessarily Mongabay.
Did the tides turn for oceans at COP28? Climate summit draws mixed reviews
- The ocean featured in many negotiations around the climate crisis at the U.N. climate summit known as COP28, which took place in Dubai between Nov. 30 and Dec. 13.
- The final version of the global stocktake (GST), which served as the main agreement for COP28, referred to the importance of protecting and preserving the ocean and coastal ecosystems, and called for “ocean-based action.”
- However, experts say the GST does not capture the necessary urgency to curtail fossil fuel emissions and may encourage the launch of controversial and still-untested geoengineering techniques that aim to lock away carbon in the ocean.
- COP28 was also the stage for several large pledges to support the protection of marine and coastal ecosystems.
Carbon credit certifier Verra updates accounting method amid growing criticism
- The world’s largest carbon credit certifier, Verra, has overhauled its methods for calculating the climate impacts of REDD projects that aim to reduce deforestation.
- REDD stands for reducing emissions from deforestation and forest degradation.
- The emissions reductions from these projects can be sold on the voluntary carbon market to individuals and companies, which proponents say provides a vital stream of funding for forest conservation.
- The update changes the process for calculating deforestation baselines, which help determine how effective a project has been at reducing forest loss and keeping the carbon those trees contain out of the atmosphere.
Jamaica battles relentless plastic pollution in quest to restore mangroves
- In recent decades, mangroves in Jamaica have declined rapidly, from about 15,000 hectares (37,000 acres) in the 1970s to about 9,945 hectares (24,574 acres) now.
- Currently there are several efforts to restore mangroves in the island country, as experts recognize the many ecosystem services they provide, including the protection and stabilization of coastlines as human-induced climate change worsens.
- However, restoration efforts face numerous challenges: Near Kingston, the main one is voluminous tides of plastic waste, which can stunt mangrove growth or kill them.
Is ocean iron fertilization back from the dead as a CO₂ removal tool?
- After a hiatus of more than 10 years, a new round of research into ocean iron fertilization is set to begin, with scientists saying the controversial geoengineering approach has the potential to remove “gigatons per year” of carbon dioxide from Earth’s atmosphere.
- The idea behind ocean iron fertilization is that dumping iron into parts of the ocean where it’s scarce could spark massive blooms of phytoplankton, which, when they die, can sink to the bottom of the sea, carrying the CO₂ absorbed during photosynthesis to be sequestered in the seabed for decades to millennia.
- So far, proof that this could work as a climate-change solution has remained elusive, while questions abound over its potential ecological impacts.
- Scientists with the Woods Hole Oceanographic Institution in Massachusetts, U.S., recently received $2 million in funding from the U.S. government that will enable computer modeling research that could pave the way for eventual in-ocean testing, effectively reviving research into ocean iron fertilization.
Amid record melting, countries fail again to protect Antarctic waters
- The Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR), the intergovernmental body charged with protecting marine life and managing fisheries in the Southern Ocean, met from Oct. 16-27 in Hobart, Australia, with 26 member countries and the European Union participating.
- For the seventh year in a row, the CCAMLR declined to establish new marine protected areas (MPAs) around Antarctica, despite having committed to creating “a representative network of MPAs” in 2009.
- Scientists, conservationists and some governments have been pushing for greater protections, concerned that the melting ice in Antarctica has reached alarming levels, jeopardizing some key populations of penguins, krill, whales, seals and other marine animals.
- The stalemate came even as a new threat to wildlife emerged in the region: the discovery last week that a virulent form of avian flu had reached Antarctic bird colonies.
Climate refugees? As the sea warms, corals thrive in Japan’s cool waters
- As tropical and subtropical coral reefs succumb to bleaching due to climate change in many parts of the world, the idea that they could take refuge in cooler, temperate seas has offered cause for hope.
- For a while, this is exactly what researchers thought was happening in Japan, where corals are replacing seaweed as the dominant benthos in many places, shaking up both ecosystems and coastal economies.
- But the latest research has tempered those hopes, showing that it’s mainly Japan’s genetically distinct temperate corals that have been expanding their range and edging out seaweed.
- The long-term implications of this shift are unclear, but researchers say it could take tens of thousands of years for these new high-latitude coral communities to evolve the structures, niches and symbioses necessary to support biodiversity on par with the world’s current tropical reefs.
Record North Atlantic heat sees phytoplankton decline, fish shift to Arctic
- Scientists warn that record-high sea surface temperatures in the North Atlantic Ocean this year are having consequences for sea life.
- As marine heat waves there have worsened over the years, populations of phytoplankton, the base of the oceanic food chain, have declined in the Eastern North Atlantic.
- With experts predicting more heat anomalies to come, North Atlantic fish species are moving northward into the Arctic Ocean in search of cooler waters, creating competition risks with Arctic endemic species and possibly destabilizing the entire marine food web in the region.
- Lengthening and intensifying marine heat waves around the globe are becoming a major concern for scientists, who warn that the world will see even greater disruptions to ocean food chains and vital fisheries, unless fossil fuel burning is curtailed.
An ‘aquatic moonshot’ in Vietnam aims to fight livestock methane with seaweed
- Scientists from the R&D company Greener Grazing aim to reduce global greenhouse gas emissions by growing and marketing a red seaweed (Asparagopsis taxiformis) as an additive for livestock feed.
- Worldwide, some 3 billion cattle and sheep produce roughly 231 billion pounds of methane annually; researchers estimate some 100 million tons of A. taxiformis would be needed to eliminate 98% of those emissions, a figure that’s roughly three times current global production of all seaweeds.
- Greener Grazing is experimenting with growing A. taxiformis in central Vietnam’s Van Phong Bay, but there are challenges.
- Skeptics also say the benefits of seaweed are limited in both the amount of methane that can be reduced as well as the capacity for scaling production to meet the size of the problem.
Seaweed: The untapped economic potential for Bangladesh
- Bangladesh currently produces some 400 tons of seaweed, valued at 55 million taka (about $500,000), while a study suggested the country could produce 50 million tons of seaweed annually by 2050.
- Despite the potential to grow and earn more foreign currency through export, the sector is dealing with a number of difficulties, including inadequate investment as well as proper guidelines and regulations.
- According to the Food and Agriculture Organization (FAO), seaweed farming is one of the fastest-growing aquaculture sectors globally, with an annual production of about 33 billion tons, valued at $11.8 billion.
Microplastics pose risk to ocean plankton, climate, other key Earth systems
- Trillions of microplastic particles in the ocean threaten marine life, from huge filter-feeders to tiny plankton. Although not lethal in the short term, the long-term impacts of microplastics on plankton and marine microbes could disrupt key Earth systems such as ocean carbon storage and nitrogen cycling.
- Oceans represent Earth’s largest natural carbon store and are crucial to mitigate atmospheric CO2 increase. Carbon taken up by plankton and stored in the deep ocean — known as the biological carbon pump — is a major process in ocean carbon storage. Microplastics may “clog” this pump and slow ocean carbon uptake.
- Microplastics in marine sediments alter microbial communities and disrupt nitrogen cycling, potentially magnifying human-caused problems like toxic algal blooms. Changes in plankton communities at the ocean surface could exacerbate deoxygenation driven by climate change, starving marine organisms of oxygen.
- Small plastic particles are impossible to remove from the oceans with current technology, so stopping pollution is a priority. Plastic production continues to soar year-on-year, but a U.N. treaty to address plastic pollution could offer a glimmer of hope that the international community is ready to take action.
‘We don’t have much time’: Q&A with climate scientist Pierre Friedlingstein
- “It’s not going in the right direction yet,” Pierre Friedlingstein tells Mongabay of the effort to meet the Paris Agreement goals; a member of the IPCC and a climate professor, he says he’s mildly optimistic about the trend in global emissions.
- Friedlingstein says he’s hoping deforestation will go down in the coming years in Brazil, but he’s not sure that Indonesia, another major global carbon sink, is ready to go in the right direction at the moment.
- He says the COVID-19 pandemic showed that climate is still “not on the top of the list” of government priorities, given that all nations sought to boost economic growth after lockdowns, despite the carbon emissions they incurred.
U.N. ‘stocktake’ calls for fossil fuel phaseout to minimize temperature rise
- The U.N. climate change agency published a new report Sept. 8 confirming that while there has been progress on climate change mitigation since the landmark Paris Agreement in 2015, more needs to be done to limit the global rise in temperatures at 1.5°C (2.7°F) above pre-industrial levels.
- The report is an element of the global stocktake, a Paris Agreement-prescribed inventory of progress toward climate-related goals.
- The authors of the report called for phasing out fossil fuels and ramping up renewable energy.
- The global stocktake process will conclude at the U.N. climate conference (COP28) beginning Nov. 30 in Dubai, United Arab Emirates.
Sensing tech used in oil pipelines can also track Arctic sea ice, study shows
- Scientists have used undersea fiber-optic cables in the Arctic to remotely track the presence and extent of sea ice.
- Sea ice is usually monitored with the help of satellites; however, the lack of high-resolution images and the low frequency of data collection makes it difficult to do in-depth analysis.
- Using a method commonly employed to monitor oil pipelines and highways, the scientists looked for changes in signals sent down a fiber-optic cable in the Beaufort Sea that would indicate the presence of sea ice.
- While promising, the method can’t yet be used to measure the thickness of sea ice or to determine how far the ice extends to either side of the cable.
Study finds old pear trees make for surprisingly rich reef habitats
- In a new study, researchers used old pear trees to create artificial reefs and settled them in the Wadden Sea in the Netherlands to see what kinds of marine biodiversity aggregated on or around them.
- They found that the tree reefs attracted a surprising amount of biodiversity over a short period of time, including sessile organisms like barnacles and mobile species like fish and crabs.
- The authors say tree reefs can be replicated in other parts of the world, mainly temperate regions.
Hope, but no free pass, as Pacific corals show tolerance to warming oceans
- New research suggests that coral reefs in the Pacific islands of Palau are becoming increasingly tolerant to thermal stress brought on by climate change.
- The study found that Palau’s coral reefs appeared to suffer less bleaching over three successive marine heat waves in 1998, 2010 and 2017.
- While the findings provide some hope for coral reefs, one expert says the study has some limitations in providing a clear picture of how corals respond to different heat events.
- Scientists also say that reducing carbon emissions is essential to safeguard coral reefs — and to secure the planet’s future.
‘All will be well’: Q&A with Kenyan fisher turned coral gardener Katana Ngala
- Once a fisherman, Katana Ngala has been restoring corals near his home in Kuruwitu, Kenya, for more than 20 years.
- Early on, the area’s coral was degraded due to destructive fishing practices and coral bleaching, and he and other fishermen were experiencing diminished catches.
- Now the coral and fish are flourishing in the area, which the local community set aside as a no-fishing zone.
- Ngala spoke about the changes he’s seen in the coral garden over time and how he shares his commitment to the sea with fishers, students, scientists and the wider community in an interview with Mongabay at his seaside coral workshop.
Kenyan fishers put new twists on an age-old marine conservation system
- Over the past two decades Kenyan fishing communities have been setting up no-fishing zones called tengefus, Swahili for “set aside.”
- The idea was inspired by the fishing habits of their forebears, who prior to colonization established seasonal fishing closures to ensure plentiful harvests.
- Today there are 22 tengefus in various stages of development in the country, some more successful than others.
- Successful tengefus have seen fish populations and coral cover increase, and they’ve established tourism enterprises that fund community initiatives. To work, experts say tengefus need support from communities, donors and the government.
Prickly babies: A Jamaican nursery aims to restore sea urchins felled by disease
- The long-spined sea urchin (Diadema antillarum) is a key algae grazer in the Caribbean. A disease outbreak in the 1980s killed off most of the urchins, resulting in the overgrowth of many Caribbean coral reefs with algae.
- Last year, a recurrence of the disease hampered the species’ slow recovery. This time, scientists were able to discover the culprit, which they revealed in a recent paper.
- The waters of Jamaica’s Oracabessa Bay Fish Sanctuary remained largely unaffected by the disease. Scientists there collected healthy long-spined sea urchins and started an urchin nursery in hopes of restoring the species on reefs around the island.
- This story was produced with support from the Pulitzer Center.
Study reveals turtles’ millennia-old food affair with North African seagrass
- Researchers have traced the 3,000-year-old “food footprints” of endangered green sea turtles around the Mediterranean.
- By comparing turtle bone samples from Bronze and Iron Age archaeological sites to skin samples from turtles they’re tracking by satellite today, they’ve uncovered turtles’ enduring preference for the same sea meadows.
- The findings highlight the importance of protecting these underwater meadows, which face degradation due to conversion, pollution and climate change.
‘The deep sea is vital to protect the ocean’: Q&A with France’s Hervé Berville
- In November, France took a strong position on deep-sea mining by declaring that this future activity should be banned in international waters. The nation has also banned it from its national waters.
- Berville also said he wants to make sure there is a “coalition in favor of a principle of precaution or moratorium.”
- Member states of the International Seabed Authority, the UN-associated mining regulator, recently agreed to push back its timeline for finalizing rules that would enable deep-sea mining to start.
- Mongabay’s Elizabeth Claire Alberts interviewed Berville at the French Embassy in Kingston, Jamaica, during the meeting of the ISA assembly in July.
Scientists: Fishing boats compete with whales and penguins for Antarctic krill
- Scientists and campaigners recently documented huge krill fishing vessels plowing through pods of whales feeding in Antarctic waters, a permitted practice they say deprives the whales of food.
- As Antarctic waters warm due to climate change, krill numbers are declining, stressing wildlife that rely on the small crustaceans at the bottom of the food chain.
- The intergovernmental body in charge of regulating the krill fishery, the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR), has taken specific steps to protect penguins and seals but not whales.
- At the same time, CCAMLR has stalled on the establishment of new marine protected areas and the adoption of new conservation measures. A special meeting to advance protected areas concluded June 23 with no progress.
West African fishers strike for fair wages and ‘respect’ on EU-owned vessels
- African fishers, mostly from Senegal and Ivory Coast who work on dozens of EU vessels that operate in West Africa and the Indian Ocean, took part in a strike that lasted from June 5-8, alleging wage violations.
- Vessels owned by EU companies are allowed to fish in foreign countries’ waters through agreements between the EU and the host nations. However, a third of such vessels operating in West Africa use flags of other countries and evade labor rights provisions agreed to under these pacts.
- Fishers who participated in the strike told Mongabay they were fighting for more than fair wages, saying that African sailors were not treated with respect on European boats despite doing some of the most arduous jobs.
- Seafarers’ unions called off the strike after the Senegalese government initiated negotiations with vessel owners and unions. Talks are expected to conclude in five months.
New hope in the Mediterranean: Scientists find deep corals withstand heat waves
- Over the past decade, the Mediterranean Sea has experienced frequent, destructive marine heat waves that have impacted a diversity of marine life, including red gorgonians (Paramuricea clavata).
- In 2022, researchers launched “Noah’s Ark of the Deep,” an expedition to study the gorgonians in the western Mediterranean Basin. In April, the second mission of the expedition explored gorgonians below 50 meters (164 feet).
- While the gorgonians in shallow waters suffered as temperatures rose, corals in deeper waters appeared untouched by the impacts of thermal stress.
- Researchers are currently trying to understand if these deeper gorgonians can help repopulate shallow populations if climate conditions allow them to regenerate.
Science and culture join forces to restore 120 miles of Hawaiian reefs
- A new program in Hawai‘i, known as Ākoʻakoʻa, will focus on restoring 193 kilometers (120 miles) of coral reefs off the west of the Big Island, which have been in
decline for the past 50 years.
- A key aspect of the program will be the building of a new research and coral propagation facility in Kailua-Kona on the Big Island.
- While the program will be largely science-driven, it will also rely on the traditional knowledge of community leaders and cultural practitioners.
New digital tool maps blue carbon ecosystems in high resolution
- The Blue Carbon Explorer, a digital tool developed by the nonprofit Nature Conservancy and the Earth-imaging company Planet, combines satellite imagery, drone footage and fieldwork to map mangroves and seagrass in the Caribbean, Papua New Guinea and Indonesia.
- The tool aims to help scientists, conservationists and governments gauge mangrove health and identify areas in need of restoration.
- The Blue Carbon Explorer comes at a time of growing interest in blue carbon ecosystems as potential nature-based solutions for climate change.
Expedition to Pacific ecosystems hopes to learn from their resilience
- An expedition led by National Geographic’s Pristine Seas project will voyage across the Pacific over five years to gather information about marine ecosystems needing protection.
- The Pristine Seas team will collaborate with Pacific island nation governments, communities, Indigenous and local peoples, and local scientists, to gather data and produce films.
- The first stop of the expedition will be the southern Line Islands, part of Kiribati, to understand how its reefs recovered after an El Niño triggered a large-scale bleaching event in 2015 and 2016.
Melting Arctic sea ice is changing bowhead whale migrations, study finds
- Research has found that some bowhead whales in the Bering–Chukchi–Beaufort (BCB) population are no longer migrating to the northwestern Bering Sea in the winter but remain in the Canadian Beaufort Sea.
- These migratory shifts are occurring as sea ice declines in the region due to climate change.
- These changes could mean that bowhead whales become more susceptible to ship strikes, underwater noise, and entanglements, and that Indigenous communities may not be able to rely on bowhead whales for nutrition and cultural subsistence.
- However, this bowhead population is currently not threatened, and these changes may not be fully impacting Indigenous communities yet.
Saving forests to protect coastal ecosystems: Japan sets historic example
- For hundreds of years, the island nation of Japan has seen various examples of efforts to conserve its coastal ecosystems, vital to its fisheries.
- An 1897 law created protection forests to conserve a variety of ecosystem services. “Fish forests,” one type of protection forest, conserve watershed woodlands and offer benefits to coastal fisheries, including shade, soil erosion reduction, and the provision of nutrients.
- Beginning in the late 1980s, fishers across Japan started planting trees in coastal watersheds that feed into their fishing grounds, helping launch the nation’s environmental movement. Although the fishers felt from experience that healthy forests contribute to healthy seas, science for many years offered little evidence.
- New research using environmental DNA metabarcoding analysis confirms that greater forest cover in Japan’s watersheds contributes to a greater number of vulnerable coastal fish species. Lessons learned via Japan’s protection and fish forests could benefit nations the world over as the environmental crisis deepens.
Parasites of the Caribbean: Study pinpoints cause of sea urchin die-off
- Once abundant in the Caribbean, long-spined sea urchins (Diadema antillarum) experienced a mass die-off in the early 1980s, contributing to coral reef deterioration.
- Another die-off occurred in 2022, leading to a further decline in coral reef health in some parts of the Caribbean.
- A new study has identified the culprit: a parasite called a ciliate that took over the sea urchins’ bodies and quickly killed them.
- While researchers are still trying to determine how this disease is transmitted, they say it’s possible that climate change played a role.
Bringing the ocean’s vast ‘awesomeness’ to light: Q&A with Farah Obaidullah
- “The Ocean and Us,” edited by ocean advocate Farah Obaidullah, provides information from more than 35 female experts on various topics related to the ocean.
- These cover, among others, climate change, overfishing, pollution, ocean management schemes, the human relationship with the ocean, and inclusion and diversity in the ocean space.
- The book helps fulfill the aims of “ocean literacy,” a concept identified by the United Nations as a key driver for achieving the U.N. Decade of Ocean Science for Sustainable Development outcomes.
- “The Ocean and Us” was published by Springer Nature in February 2023.
Southern atmospheric rivers drive irreversible melting of Arctic sea ice: Study
- Arctic sea ice extent has reached its winter maximum extent for 2023 at 14.62 million sq. km., the fifth lowest on record. Combined with this year’s unprecedentedly small Antarctic sea ice summer minimum extent, global sea ice coverage reached a record low in January.
- Arctic sea ice is not only receding, but also seriously thinning. New research has found that a huge melt in 2007 and associated ocean warming kicked off a “regime shift” to thinner, younger, more mobile and transient ice that may be “irreversible.”
- A big reason why Arctic sea ice is declining even in the frigid polar winter is that atmospheric rivers, which carry warmth and rainfall like the deluges seen in California recently, are surging up from the south and penetrating the Arctic more often.
Sea level rise looms, even for the best-prepared country on Earth
- The Netherlands, a low-lying European country with more than a quarter of its land below sea level, has been going to great lengths to protect itself from the impacts of climate change, including sea level rise and extreme weather events like heavy rain.
- But even for the Netherlands, a country with the wealth and experience to address these issues, the future remains uncertain, mainly because a range of possible scenarios could play out after 2050.
- According to the Intergovernmental Panel on Climate Change, a low-emissions scenario for the greenhouse gases that amplify global warming could elevate sea levels about half a meter (1.6 feet) above present levels by 2100; a higher-emissions scenario could lead to a 2-m (6.6-ft) rise by 2100 and a 5-m (16.4-ft) rise by 2150.
- Experts say that most other countries need to take the threat of sea level rise more seriously, and that engineering challenges, a lack of awareness and education, sociocultural concerns, and financial constraints are hampering their preparation.
IPCC warns of ‘last chance’ to limit climate change via drastic emissions cuts
- The United Nations’ Intergovernmental Panel on Climate Change (IPCC) released its sixth “synthesis” report March 20, after its approval by world leaders at a weeklong meeting in Switzerland.
- The report’s authors conclude that immediate reductions in carbon emissions are necessary to limit the rise in the global temperature to 1.5° Celsius (2.7° Fahrenheit) above pre-industrial levels.
- Scientists, activists and observers are calling for an end to fossil fuel use.
Machine learning makes long-term, expansive reef monitoring possible
- Conservationists can now monitor climate impacts to expansive marine ecosystems over extended periods of time, a task that used to be impossible, using a tool developed by scientists in the U.S.
- The machine learning tool, called Delta Maps, provides a new way to assess which reefs might be best suited for survival, and which play a key role in delivering larvae to others, and therefore should be targeted for preservation efforts, according to the scientists.
- The scientists used the tool to examine the impacts of climate change on connectivity and biodiversity in the Pacific Ocean’s Coral Triangle, the planet’s most diverse and biologically complex marine ecosystem.
- The authors also noted that the Coral Triangle had more opportunities for rebuilding biodiversity, thanks to the region’s dynamic climate component, than anywhere else on the planet.
On Lombok, rising sea levels force fishers into different jobs
- Residents of the Indonesian island of Lombok say sea levels are rising at alarming levels, swallowing seaside towns.
- People are abandoning their family trade of fishing to instead grow seaweed or leave the island for stable employment.
- The provincial government created a climate adaptation task force to address the compounding problems of climate change, as families send their children to school and hope they choose a life different from fishing.
An El Niño is forecast for 2023. How much coral will bleach this time?
- Forecasts suggest that an El Niño climate pattern could begin later this year, raising sea temperatures at a time when global temperatures are already higher than ever due to human-driven climate change.
- If an El Niño develops and it becomes a moderate to severe event, it could raise global temperatures by more than 1.5°C (2.7°F) above pre-industrial levels, the threshold set by the Paris Agreement.
- An El Niño would generate many impacts on both terrestrial and marine ecosystems, including the potential for droughts, fires, increased precipitation, coral bleaching, invasions of predatory marine species like crown-of-thorns starfish, disruptions to marine food chains, and kelp forest die-offs.
Re-carbonizing the sea: Scientists to start testing a big ocean carbon idea
- Ocean alkalinity enhancement (OAE) involves releasing certain minerals into the ocean, sparking a chemical reaction that enables the seawater to trap more CO₂ from the air and mitigating, albeit temporarily, ocean acidification.
- Some scientists believe OAE could be a vital tool for drawing down and securely storing some of the excess CO₂ humanity has added to the atmosphere that is now fueling climate change.
- Yet many questions about OAE remain, including most prominently how it would impact marine life and ecosystems.
- Several programs are aiming to spark the research needed to answer these questions, including field tests in the ocean.
For threatened seabirds of NE Atlantic, climate change piles on the pressure
- A new report shows that puffins and other seabird species in the Northeast Atlantic are at risk from climate change.
- It warns most seabird species would lose a substantial amount of their current breeding sites and available prey due to climate change, but each species has unique challenges.
- The authors describe potential interventions that conservation experts can enact to protect the species, including the relocation of seabird breeding sites, supplementary feeding, and providing resources that help seabirds deal with extreme weather events such as flooding and heat waves.
2022’s top ocean news stories (commentary)
- Marine scientists from the University of California, Santa Barbara, share their list of the top 10 ocean news stories from 2022.
- Hopeful developments this past year include the launch of negotiations on the world’s first legally binding international treaty to curb plastic pollution, a multilateral agreement to ban harmful fisheries subsidies and a massive expansion of global shark protections.
- At the same time, the climate crises in the ocean continued to worsen, with a number of record-breaking marine heat waves and an accelerated thinning of ice sheets that could severely exacerbate sea level rise, underscoring the need for urgent ocean-climate actions.
- This post is a commentary. The views expressed are those of the authors, not necessarily Mongabay.
Hunting for future-proof marine plants in the acidic waters bathing a volcano
- The naturally acidic seawater near an underwater volcano in Italy mimic pH levels that according to worst-case climate projections will be common by the end of the century and beyond.
- Scientists are studying local seagrass and seaweed responses to the acidic conditions.
- One question is whether they could be used for restoration purposes in other places that may become more acidic in a not-so-distant future.
- Even so, some researchers point out that these carbon-sequestering marine plants face more immediate challenges from pollution, habitat degradation and warming waters that need addressing for restoration to succeed.
Extinct sea cow’s underwater engineering legacy lives on today, study finds
- In a new study, scientists said that the extinct Steller’s sea cow impacted kelp forests in the North Pacific by browsing at the surface, which would have encouraged the growth and strengthening of the algal understory.
- Not only would sea cows have positively impacted kelp forests in the past, but they may have also enhanced their resilience into modern times, according to the authors.
- Globally, kelp forests face many threats, including ocean warming, which can lead to an overabundance of predatory urchins.
- The authors suggest that it might be possible for humans to reproduce the species’ impact on the canopy of kelp forests to enhance kelp forest resilience.
In Sierra Leone’s fishing villages, a reality check for climate aid
- In April, Mongabay’s Ashoka Mukpo visited the Sherbro estuary, a sprawling riverine ecosystem of mangroves and coastal fishing villages on the Sierra Leonean coastline.
- Like other coastal areas in West Africa, the Sherbro estuary is already suffering the impacts of climate change, including flooding and higher temperatures.
- Between 2016 and 2021, USAID financed mangrove replanting and the construction of makeshift seawalls in villages here as part of a coastal climate resilience aid project.
- The project’s struggles here are an example of the difficulties that climate aid efforts can face when they meet the economic and social needs of people in vulnerable areas.
Animating the Carbon Cycle: Earth’s animals vital allies in CO2 storage
- The idea of animating the carbon cycle (ACC) is relatively new. The concept champions the role that healthy populations of wild animals, both terrestrial and marine, can play in boosting the ability of ecosystems to store carbon, helping the planet stay within 1.5°C (2.7°F) of temperature rise over pre-industrial levels.
- But for ACC to be fully effective, humanity needs to preserve and protect intact nature. We also need to rebuild populations of wild animals, including apex predators such as wolves, large herds of herbivores, and invertebrates such as pollinators. By doing so we can help rebalance the functions of natural systems.
- ACC puts the spotlight on oceans too, and the role animals there can play in sequestering carbon. It calls for greater protection of the seas and marine life, allowing whale populations to grow, and protecting mesopelagic fish — the largest group of vertebrates on the planet — from overfishing.
- By looking at the bigger picture of animal-plant-ecosystem relationships, and based on the growing popularity of nature-based climate solutions, scientists believe that now is the time for the wider conservation and rewilding movements to embrace ACC to help animals fulfill their vital roles in the carbon cycle.
Melting ice created the perfect storm for a rapidly acidifying Arctic Ocean
- The Arctic Ocean has grown more acidic at a surprising rate in recent years, three times faster than the rest of the global ocean.
- Melting sea ice has exposed the top level of the Arctic Ocean to air rich with carbon dioxide, creating a layer that sopped up carbon from the atmosphere.
- Increased acidity may hamper the ability of marine organisms to build their shells, causing ripple effects through the Arctic food web.
France’s Macron joins growing chorus calling for deep-sea mining ban
- On Nov. 8, French President Emmanuel Macron became the first head of state to call for a complete ban on deep-sea mining, an activity that would extract industrial quantities of minerals from the seabed in international waters in the near future.
- Delegates of the International Seabed Authority (ISA) are currently meeting in Kingston, Jamaica, to discuss deep-sea mining regulations, and many member states are using this forum to express their concerns about mining going ahead.
- In June 2021, the Pacific island nation of Nauru, which sponsors Nauru Ocean Resources Inc. (NORI), a subsidiary of Canadian firm The Metals Company (TMC), triggered a “two-year rule” that could force the ISA to allow mining to go ahead in two years with whatever regulations are in place.
Negotiations to conserve Antarctic Ocean end in stalemate on many issues
- The 41st annual meeting of the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR), the intergovernmental body charged with conserving marine life in the Southern Ocean and managing fisheries there, ended Nov. 4 with little progress made on several key issues.
- In 2009 CCAMLR committed to creating a network of marine protected areas to preserve Antarctic ecosystems. It established one that year and another in 2016, but since then China and Russia have repeatedly blocked the creation of additional protected areas, as well as other conservation-related measures.
- The commission also failed to reach the consensus required to enact new regulations for the krill and toothfish fisheries, or to protect a vast nesting area for icefish discovered earlier this year.
- CCAMLR members did agree to designate eight new vulnerable marine ecosystems, areas home to slow-growing organisms such as corals, sponges, brittle stars and feather stars that are now permanently protected from bottom fishing.
Arctic sea ice loss to increase strong El Niño events linked to extreme weather: Study
- The frequency of strong El Niño events could increase by 35% by the end of the century as Arctic sea ice begins to melt out completely in the summer, according to a recent modeling study. El Niños — buildups of especially warm water in the eastern Pacific off of Peru — often trigger ‘devastating’ droughts, floods and cyclones around the globe.
- The findings provide more evidence that Arctic warming is affecting weather in other parts of the world — not only in the mid-latitudes, but as far away as the tropics.
- Other recent studies have found that sea ice loss is causing rapid acidification of the Arctic Ocean and more extreme precipitation and flooding in Svalbard, a Norwegian archipelago located between mainland Norway and the North Pole.
Fish-feed industry turns to krill, with unknown effects on the Antarctic ecosystem
- The Antarctic krill fishing industry has been growing in the past two decades.
- The global growth of fish farming is driving the demand for Antarctic krill as an alternative to wild fish in fish feeds, amid the depletion of many wild fish stocks.
- Independent scientists say the krill fishery could have a detrimental effect on Antarctica’s predator populations, which are also suffering from the impacts of global warming.
- The krill industry is expanding its fleet and planning to significantly increase catches in the next few years.
Heat-sensing drone cameras spy threats to sea turtle nests
- Researchers used heat-detecting cameras mounted on drones to monitor sea turtle nesting on a beach in Costa Rica’s Osa Peninsula.
- Using thermal infrared imagery, researchers detected 20% more turtle nesting activity than on-the-ground patrollers did. The drone imagery also revealed 39 nest predators and other animals, as well as three people, assumed to be poachers, that were not detected by patrollers.
- In Costa Rica, turtle eggs are sold locally and illegally for their alleged aphrodisiac properties. Six out of the seven species of sea turtles are threatened globally, and protecting their eggs is one of the easiest ways to ensure they endure into the future.
- The lead author says these methods are still rather expensive and aren’t a replacement for patrollers but could be an extra tool that they can use to get a big improvement on night patrols, especially on nesting beaches that are dangerous and inaccessible.
Proposal to grant the ocean rights calls for a sea change in legal framework
- In 2022, the professional sporting group the Ocean Race launched a bid to establish the Universal Declaration of Ocean Rights (UDOR).
- The proposed legal structure would give the ocean legal rights within a multilateral governance system.
- While some laws protect parts of the ocean, there is currently no framework to specifically recognize the ocean’s inherent rights on a national or international level.
- Various countries have already voiced their support for the UDOR, including Monaco, Cabo Verde and Panama.
A ‘super reef’ recovery raises hopes — but also questions about its resilience
- Experts documented the substantial recovery of coral reefs around the southern Line Islands in the central Pacific after the area was hit by a large-scale coral bleaching event in 2015 and 2016.
- Many factors may have contributed to the reef’s recovery, including the fact that the reef is seemingly untouched by human activity, which helped maintain a healthy and resilient ecosystem.
- But other experts question whether this reef would be able to recover after more frequent bleaching events, which are predicted to increase as global temperatures continue to rise.
2022: Another consequential year for the melting Arctic
- Arctic sea ice extent shrank to its summertime minimum this week — tied with 2017 and 2018 for the 10th lowest ever recorded. However, the last 16 consecutive years have seen the least ice extent since the satellite record began. Polar sea ice extent, thickness and volume all continue trending steeply downward.
- Arctic air temperatures were high this summer, with parts of the region seeing unprecedented heating. Greenland saw air temperatures up to 36° F. above normal in September. Canada’s Northwest Territories saw record highs, hitting the 90s in July. Sea temperatures also remained very high in many parts of the Arctic Ocean.
- Scientists continue to be concerned as climate change warms the far North nearly four times faster than the rest of the planet, sparking concern over how polar warming may be impacting the atmospheric jet stream, intensifying disastrous extreme weather events worldwide, including heat waves, droughts and storms.
- While a mostly ice-free Arctic could occur as early as 2040, scientists emphasize that it needn’t happen. If humanity chooses to act now to drastically reduce greenhouse gas emissions, downward sea ice extent and volume trends could potentially be reversed.
Agulhas Current enigma: An oceanic gap in our climate understanding
- Comprehending the workings of western boundary ocean currents, like those of the Agulhas Current off the South African coast, may hold a key to Earth’s climate system. But understanding this particular current is hampered by a major lack of in-situ data. This gap leaves us in the dark about local, regional and global climate impacts.
- The Agulhas Current, located in the Indian Ocean, is one of the most energetic ocean current systems in the world. Changes to it can impact local weather in South Africa and elsewhere in the Southern Hemisphere, and perhaps influence large-scale climatic changes in the Northern Hemisphere and globally as well.
- However, it is not clear how and what these impacts may be, or when they may occur. With climate change escalating rapidly due to unabated human carbon emissions, it is now more important than ever that we understand the impacts of Southern Hemisphere ocean currents, and integrate their actions into climate models.
- But attempts at long-term monitoring of the Agulhas Current System have not been fully successful. Accomplishments and failures to date have underscored significant local research capacity challenges, and differences in the approach to, and financing of, ocean science in the Global North as compared to the Global South.
Acid test: Are the world’s oceans becoming too ‘acidic’ to support life?
- The world’s oceans absorb about a quarter of humanity’s carbon dioxide emissions, buffering us against higher atmospheric CO2 levels and greater climate change. But that absorption has led to a lowering of seawater pH and the acidification of the oceans.
- The process of ocean acidification is recognized as a leading threat to ocean life due to its impairment of calcifying organisms and other marine species. The full impacts of acidification are unknown, but at some point reduced pH could be disastrous biologically.
- Researchers have designated ocean acidification as one of nine planetary boundaries whose limits, if transgressed, could threaten civilization and life as we know it. But there is debate as to whether there is a global boundary for this process, since acidification impacts some regions and species more or less than others, making it hard to quantify.
- Scientists agree that the primary solution to ocean acidification is the lowering of carbon emissions, though some researchers are investigating other solutions, such as depositing alkaline rock minerals into oceans to lower the pH of seawater.
‘Mind-blowing’ marine heat waves put Mediterranean ecosystems at grave risk
- A recent study reveals the widespread effects of climate change-driven marine heat waves on the ecological communities of the Mediterranean Sea.
- Rises in sea surface temperatures as high as 5° Celsius (9° Fahrenheit) above normal have caused die-offs in 50 different taxonomic groups of animals from around the Mediterranean Basin.
- These far-reaching impacts of the warming sea could devastate the fisheries on which many of the Mediterranean region’s 400 million people rely.
- Researchers advocate bolstering and expanding marine protected areas. Although they can’t hold back the warmer waters that have proven deadly to the sea’s rich biodiversity, these sanctuaries can help ensure that these species don’t have to cope simultaneously with other pressures, such as overfishing or pollution.
Seaweed an increasingly fragile lifeline for Philippine farmers
- Commercial seaweed farming began in the Philippines in the 1970s and has grown to be one of the country’s most significant aquaculture enterprises, supporting more than 200,000 coastal families.
- In communities in Palawan, seaweed farming also plays a role in protecting marine life, with small farmers serving as extra eyes and ears in the fight against illegal fishing.
- As climate change intensifies, warmer waters are making seaweed farms more susceptible to pests and diseases, threatening the survival of the industry and the families that depend on it.
Study paints ‘bleak picture’ for nearly all marine life without emissions cuts
- New research published in Nature Climate Change has found that nearly 90% of assessed marine life would be at high or critical risk by 2100 if the world continues upon a high-emissions pathway.
- It found that the risks would be more concentrated in the tropics, and that top predators would be more at risk than species lower down the food chain.
- However, if countries drastically reduce their emissions, the study found that climate risk would decrease for more than 98% of these species.
In Sumatra, rising seas and sinking land spell hard times for fishers
- Fishers operating near the port of Belawan on the Indonesian island of Sumatra are reporting declining catches and a hit to their livelihoods from tidal flooding.
- The flooding has grown more frequent and severe, exacerbated by rising seas and the clearing of mangrove forests for oil palm plantations.
- Traders who buy local catches have also been affected by the flooding, which can cut off commercial transport routes.
- This region of northern Sumatra is one of the areas targeted by the Indonesian government for mangrove restoration, but until that yields results, the fishers say they’re essentially helpless.
As stronger storms hit Bangladesh farmers, banks are climate collateral damage
- Farmers in coastal areas of Bangladesh are increasingly defaulting on their loans due to climate change-driven storms that are destroying the farms they put up as collateral.
- Agricultural loans for the year to May 2022 amounted to the equivalent of $3 billion, or a fifth of the value of all loans distributed in Bangladesh.
- Increasingly frequent and severe storms therefore pose as much of a threat to the country’s financial sector as to farming communities and the environment.
- The warming of the sea in the Bay of Bengal as a result of climate change is supercharging storms, giving them more energy, helping them to drive tidal surges farther inland and dump larger volumes of rain than before.
Climate change and overfishing threaten once ‘endless’ Antarctic krill
- Antarctic krill are one of the most abundant species in the world in terms of biomass, but scientists and conservationists are concerned about the future of the species due to overfishing, climate change impacts and other human activities.
- Krill fishing has increased year over year as demand rises for the tiny crustaceans, which are used as feed additives for global aquaculture and processed for krill oil.
- Experts have called on the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR), the group responsible for protecting krill, to update its rules to better protect krill; others are calling for a moratorium on krill fishing.
- Antarctic krill play a critical role in maintaining the health of our planet by storing carbon and providing food for numerous species.
Love ‘em and loathe ‘em: Mediterranean grapples with tasty, voracious invasive crabs
- Two invasive blue crab species have recently settled in the Mediterranean.
- Both species are voracious predators that disrupt bottom habitats, shred fishers’ nets and ruin their catches. They’re also edible.
- Mediterranean countries are considering whether to target the invasive crabs to control them, or embrace and even protect them as a new socioeconomic resource for the future.
- This story was produced with the support of the Pulitzer Center.
Sea life may downsize with ocean warming — bringing challenging impacts
- A new model predicts that marine microbes could shrink by up to 30% in the future due to climate change, impacting bigger organisms that eat them including fish, potentially disrupting the food chain from the bottom up. Smaller fish would mean impacted fisheries. Smaller microbes could mean less carbon sequestration.
- Warmer oceans hold less oxygen, and the model predicts that sea life will get smaller in response to more limited oxygen. But scientists have long debated why this downsizing occurs, and some say that other factors not considered in the model could impact oceanic microbes in unexpected ways.
- Accurately predicting warming impacts on marine life could improve ocean resource management.
‘The sea means everything’: Q&A with deep-sea mining opponent Debbie Ngarewa-Packer
- New Zealand parliamentarian and Māori activist Debbie Ngarewa-Packer has spent more than two decades serving in leadership roles, using her positions to advance social justice issues and to campaign for the protection of the marine environment.
- A key issue that Ngarewa-Packer is currently working on is a push to ban deep-sea mining in the global ocean, a proposed activity that would extract large amounts of minerals from the seabed.
- Ngarewa-Packer previously worked with other Māori activists, NGOs and community members to block consent for a deep-sea mining operation in her home district of South Taranaki on New Zealand’s North Island.
- In an interview with Mongabay, Ngarewa-Packer talks about why it’s critical to protect the deep sea from mining, what ancestral teachings say about protecting the ocean, and why she feels hopeful about the future.
Scientists strive to restore world’s embattled kelp forests
- Kelp forests grow along more than one-quarter of the world’s coastlines, and are among the planet’s most biodiverse ecosystems. But these critical habitats are disappearing due to warming oceans and other human impacts.
- Sudden recent wipeouts of vast kelp forests along the coastlines of Tasmania and California highlighted how little was known about protecting or restoring these vital marine ecosystems.
- Scientists are finding new ways to help restore kelp, but promising small-scale successes need to be ramped up significantly to replace massive kelp losses in some regions.
- Global interest in studying seaweed for food, carbon storage and other uses, may help improve wild kelp restoration methods.
‘Tendrils of hope’ for the ocean: Q&A with conservationist Charles Clover
- The latest book by Charles Clover, “Rewilding the Sea,” published by Penguin Random House UK, tells stories of what can happen when governments, scientists, conservationists and fishers work together to protect and restore the ocean, generating hope for the future.
- While the term “rewilding” usually refers to restoration efforts that take place on land, Clover argues that the sea can also be rewilded through the reinstatement of ecosystems as well as by simply allowing nature to repair itself.
- He further argues that rewilding can be achieved through new approaches to fisheries management, the creation of marine protected areas, and the protection of parts of the ocean known to sequester carbon.
- While the book acknowledges that the oceans are facing a tremendous number of pressures due to human activities, Clover calls the destruction of ocean life the “world’s largest solvable problem.”
How will climate change impact cold-water corals? Mostly through food loss, study says
- A new study warns that cold-water corals, also known as deep-water corals, could be most impacted by a decrease in food supply as climate change shifts the dynamics of the planet’s oceans.
- The authors came to this conclusion by examining how cold-water corals survived the last major period of global warming that occurred at the end of the last glacial period and the start of the current interglacial period, which is somewhat analogous to how the Earth is projected to warm by the end of this century.
- However, experts point out that cold-water corals today are subjected to a number of additional stressors, including ocean acidification, destructive fishing practices, and pollution, and that the climate is changing far more rapidly than it did in the past.
- Cold-water corals are considered to be equally important — or perhaps even more important — than tropical corals, which makes understanding their chances of survival of the utmost importance, researchers say.
In Sierra Leone, local fishers and foreign trawlers battle for their catch
- At wharfs across the Freetown peninsula in Sierra Leone, local fishers say in recent years it’s become harder to get a good catch. They blame foreign trawlers for overexploiting the country’s fish stocks.
- Sierra Leone’s Ministry of Fisheries and Marine Resources says it has systems meant to curb illegal, unreported, and unregulated fishing, but enforcement remains a challenge.
- In 2019, China signed a fisheries agreement with Sierra Leone that includes a promise to build a $55 million harbor, but some fishers say boats owned by its citizens are among the worst offenders.
Robot revolution: A new real-time accounting system for ocean carbon
- Oceans are key to understanding climate change, seeing as they take up and store 25% of the carbon that human activities add to Earth’s atmosphere. But there are big gaps in our knowledge regarding ocean carbon storage and release, and how it is evolving as climate change unfolds, a problem scientists are now addressing.
- An international deployment of thousands of robotic floats, fitted with sophisticated biogeochemical sensors, is underway and already providing real-time data that scientists can integrate into ocean carbon budgets and climate models. Many more floats are coming, with the capacity to operate in remote regions.
- One such place is the Southern Ocean around Antarctica, which accounts for almost half of the worldwide oceanic carbon sink. Windier conditions there, caused by climate change, are churning up more carbon-rich waters from the depths, releasing stored carbon and introducing unforeseen variability into ocean carbon emission estimates.
- Robots are starting to monitor these emissions in real time. More accurate ocean carbon budgets will improve accounting of land-based carbon dioxide emissions, help create more accurate assessments of how well global carbon agreements such as the Paris Agreement are meeting goals, and will help assess ocean carbon dioxide removal plans.
Oceans conference comes up with $16b in pledges to safeguard marine health
- The seventh Our Ocean Conference took place in the Pacific island nation of Palau on April 13 and 14.
- Representatives of governments, the private sector, civil society groups and philanthropic organizations made 410 commitments worth more than $16 billion toward improving the health, productivity and protection of the world’s oceans.
- Discussions focused around the importance of ocean-based climate solutions and the linkage between healthy oceans and healthy communities.
- The setting in a small island developing state lent the event a unique perspective, underscoring the crucial role and leadership of Indigenous peoples and local communities in tacking the climate change and ocean crises.
‘A huge mistake’: Concerns rise as deep-sea mining negotiations progress
- The International Seabed Authority (ISA), the U.N.-affiliated organization tasked with managing deep-sea mining activities, recently held a series of meetings to continue negotiating the development of mining regulations.
- Deep-sea mining may start as early as 2023 after Nauru triggered a two-year rule embedded in the U.N. Convention on the Law of the Sea that could essentially allow its sponsored company to start mining with whatever regulations are currently in place.
- Many states are eager to finalize a set of regulations over the next 15 months that would determine how mining can proceed in the deep sea.
- But other states and delegates have noted the lack of scientific knowledge around deep-sea mining, the absence of a financial compensation plan in the event of environmental damage, and ongoing transparency issues in the ISA — and the unlikelihood of finalizing regulatory measures in a short period of time.
The Great Barrier Reef is bleaching — once again — and over a larger area
- The Great Barrier Reef is currently experiencing its sixth mass bleaching event, and the fourth event of this kind to happen in the past six years.
- Based on aerial surveys that were concluded this week, bleaching has affected all parts of the Great Barrier Reef, with the most severe bleaching occurring between Cooktown, Queensland, and the Whitsunday Islands.
- Sea surface temperatures around the Great Barrier Reef have been higher than normal, despite the region going through a La Niña climate pattern, which usually brings cooler, stormier weather.
- Climate change remains the biggest threat to the Great Barrier Reef and other reefs around the world, experts say.
Marine cold spells, a potential buffer against warming seas, are fading away
- A new study has found that marine cold spells have decreased in number and intensity since the 1980s due to climate change.
- Marine cold spells can have both negative and positive impacts on the environment; they can wreak havoc on ecosystems like coral reefs, but they can also buffer the impacts of heat stress during marine heat waves.
- While marine cold spells are decreasing, marine heat waves are increasing — but the relationship between these two kinds of events still isn’t clear, the study says.
Ships sunk in nuclear tests host diverse corals, study says. But do we need them?
- Researchers surveyed 29 warships at Bikini Atoll and Chuuk Lagoon and found that they hosted up to a third of coral genera found on natural reefs in neighboring regions.
- This study has led researchers to ask a controversial question: Can these kinds of shipwrecks act as biodiversity havens for corals?
- While the study does not provide an answer to this question, the authors say this idea should be explored.
- Climate change is one of the biggest threats to coral reefs since rising temperatures can cause widespread bleaching events.
Multiyear ice thinner than thought as Arctic sea ice reaches winter max: Studies
- Arctic sea ice has reached its yearly maximum extent at 14.88 million sq. km., the 10th lowest on record. The up-and-down story of sea ice extent in the past year highlights how unpredictable it can be from season to season, even as the overall decline continues.
- A study employing new satellite data found that Arctic multiyear sea ice — ice that survives the summer melt — is thinning even faster than previously thought and has lost a third of its volume in just two decades.
- This comes as Antarctic sea ice extent hit a record summer low, raising questions whether it is beginning a long-term decline, although experts are wary of drawing conclusions yet.
- While summer Arctic sea ice is predicted to mostly disappear by 2050, a new study suggests we could likely preserve it through 2100 by aggressively cutting methane emissions by 2030, along with reaching net-zero CO2 emissions by 2050.
Vulnerable Antarctic reefs reveal wealth of life as rich as tropical corals
- A research expedition led by Greenpeace identified about a dozen new vulnerable marine ecosystems in Antarctica’s Weddell Sea, and documented a range of organisms, some of which were previously unknown to science.
- Researchers argue that it’s vital to protect the Weddell Sea since this region helps to regulate the global oceans.
- This week, negotiators are discussing the establishment of a U.N. treaty that would protect the high seas, which could lead to widespread ocean protection.
- In October, the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR) will also revisit the proposal to establish three marine sanctuaries in Antarctica, including one in the Weddell Sea.
As rising seas destroy Ghana’s coastal communities, researchers warn against a seawall-only solution
- Some 37% of Ghana’s coastal land was lost to erosion and flooding between 2005 and 2017.
- Severe storm surges flooded several communities in 2021, prompting the evacuation of thousands of people.
- Research indicates around 340 million people worldwide will be affected by global warming-fueled sea level rise by the middle of the century. Ghana’s government is responding to the growing crisis by fortifying some coastal areas with seawalls, but researchers say relying on seawalls alone may do more harm than good.
- This story was produced with support from the Pulitzer Center.
Can we save coral reefs? | Problem Solved
- Since the 1950s the world has lost half of its coral reef ecosystems.
- The Intergovernmental Panel on Climate Change (IPCC) predicts that with 1.5°C (2.7°F) of warming above pre-industrial levels we could lose up to 90% of the world’s coral reefs.
- This amount of warming could happen in as little as six years.
- Experts say there’s still time to save coral reefs, but it’ll require swiftly addressing the three largest impacts to reefs: land-based pollution, overfishing and, most importantly, climate change.
‘They’re going to get worse and worse’: Marine heat wave persists off Sydney
- In November 2021, an unusual marine heat wave materialized off the coast of Sydney; sea surface temperatures in the area have yet to go down.
- This marine heat wave is just one of numerous events occurring across the global oceans as human-induced climate change heats up the oceans.
- While marine heat waves can be triggered by a range of atmospheric, oceanic and climatic drivers, climate change plays a key role in driving these events.
Scientists’ secret weapon to monitor the Southern Ocean? Elephant seals
- Southern elephant seals living on Kerguelen Island, a sub-Antarctic island, are helping to gather information about the Southern Ocean with data-logging devices attached to their hair.
- For instance, the elephant seals have helped gather data on sea ice formation, ocean and ice shelf interactions, and frontal system dynamics.
- The Southern Ocean provides many ecosystem services for the planet, but the region is rapidly changing due to climate change.
‘There’s not much hope’: Mediterranean corals collapse under relentless heat
- In 2003, a marine heat wave devastated coral reef communities in the Mediterranean Sea, including the reefs in the Scandola Marine Reserve, a protected region off the coast of Corsica.
- More than 15 years later, the coral reef communities in Scandola still have not recovered.
- Researchers determined that persistent marine heat waves, which are now happening every year in the Mediterranean, are preventing Scandola’s slow-growing coral reefs from recuperating.
- Human-induced climate change is the culprit; persistent rising temperatures in the ocean have normalized marine heat waves, not only in the Mediterranean, but in the global oceans.
Safe havens for coral reefs will disappear as oceans warm, study says
- A new study found that coral reef “refugia” — places that have historically protected coral reefs from thermal stress — will decline substantially when global heating reaches 1.5°C (2.7°F) above pre-industrial levels; at 2°C (3.6°F), most coral reef refugia will disappear.
- A loss in refugia will expose corals to thermal stress that they will likely be unable to cope with, most likely leading to large-scale loss of coral reefs that will threaten marine biodiversity and food security.
- The authors suggest that management efforts should be refocused to help coral reefs adapt to a warming ocean and to assist in their migration to more hospitable locations.
- However, efforts to help corals adapt to rising temperatures may be futile as long as carbon emissions continue to rise.
Efforts to dim Sun and cool Earth must be blocked, say scientists
- Scientists are calling on political institutions to place limits on solar geoengineering research so that it cannot be deployed unilaterally by countries, companies or individuals.
- Long-term planetary-level geoengineering interventions of this kind are unprecedented and extremely dangerous, say the academics behind the letter, and should not therefore be experimented with outdoors, receive patents, public funds or international support.
- Solar geoengineering’s leading proposal — injecting billions of aerosol particles into the Earth’s stratosphere — could have severe, unintended and unforeseen consequences. Modelling suggests that it may cause drying in the Amazon rainforest
- In addition, if solar geoengineering were deployed, it would need to be maintained for decades. Sudden discontinuance would result in Earth facing what scientists call termination shock, with a sudden temperature rise due to existing atmospheric carbon emissions which would have been masked by cooling stratospheric aerosols.
As climate change melts Antarctic ice, gentoo penguins venture further south
- Researchers have discovered a new colony of gentoo penguins in Antarctica previously unknown to science.
- The colony was found on Andersson Island on the east side of the Antarctic Peninsula, which is the furthest south the species has ever been found in that region.
- Scientists say climate change played a key role in the penguins’ presence on the island, as warming temperatures and record ice melt make new locations habitable for the species.
- Scientists and conservationists are making renewed calls to establish a network for marine protected areas in Antarctica to help safeguard the region as the climate rapidly changes.
Bleached reefs still support nutritious fish, study finds
- A recent study published in the journal One Earth looked at the nutrients available in fisheries in Seychelles before and after bleaching killed around 90% of the island nation’s coral in 1998.
- Warming ocean temperatures have caused mass bleaching of corals across the tropics, sometimes causing the deaths of these reef-building animals, and the phenomenon is expected to continue as a result of climate change.
- The research found that bleached reefs continue to support fisheries that provide essential micronutrients to human communities.
In hot water: Ocean warming hits another record high on climate change
- A new study has found that, for the sixth year in a row, the world’s oceans have been hotter than they’ve ever been in recent history due to human-induced climate change.
- The research team found that last year, the upper 2,000 meters (6,600 feet) in all oceans absorbed 14 zettajoules more of human-made energy than the previous year, equal to about 145 times the world’s electricity generation in 2020.
- A warming ocean creates a multitude of issues, driving extreme weather events, accelerating sea level rise, disrupting marine biodiversity, threatening global food security, and melting polar ice shelves.
- Experts say the best way to reduce ocean climate impacts is to lower carbon emissions and meet the Paris Agreement goal of not allowing global warming to surpass 1.5°C (2.7°F) over preindustrial levels.
By cultivating seaweed, Indigenous communities restore connection to the ocean
- In many places, Indigenous communities are working to restore seaweed species that have been traditional food sources or supported traditional diets.
- From kelp farms in Alaska to seaweed-focused community education in Hawai‘i, the projects take many forms.
- These Indigenous groups are reemphasizing the ability of marine algae and plants to support food sovereignty, climate resilience, and connections to tradition.
Warmer, oxygen-poor waters threaten world’s ‘most heavily exploited’ fish
- A new report using core samples taken from the seabed has determined that the Humboldt Current system off the coast of Peru was home to smaller fish during the last interglacial period, 130,000 years ago.
- The conditions back then — with little oxygen content in the ocean and temperatures about 2°C (3.6°F) warmer than the average temperature in the current Holocene epoch — mirror those that scientists have predicted for 2100.
- While many studies have argued that warmer water and lower oxygen lead to smaller fish, the added pressure of industrial fishing has made it difficult to determine the threat that climate change will pose on fisheries.
- The Humboldt Current system is one of the most productive fisheries in the world, contributing to more than 15% of the global annual fish catch, so significant changes to this system will threaten food security.
‘Great Blue Wall’ aims to ward off looming threats to western Indian Ocean
- Ten nations in the western Indian Ocean committed this November to create a network of marine conservation areas to hasten progress toward the goal of protecting 30% of the oceans by 2030.
- Less than 10% of the marine expanse in this region currently enjoys protection, and a recent assessment highlighted the price of failure: all the coral reefs are at high risk of collapse in the next 50 years.
- The focus of these efforts won’t just be coral reefs, but also mangroves and seagrass meadows, a lesser-known underwater ecosystem critical for carbon sequestration and oceanic biodiversity.
- Even as overfishing and warming take a toll on marine health, threats from oil and gas extraction are intensifying in this corner of the Indian Ocean.
In Indonesia’s Sulawesi, a community works to defuse blast-fishing crisis
- Decades of blast fishing have destroyed much of the coral reefs off Indonesia’s Lora village, reducing fish catches.
- Increased law enforcement and advocacy by NGOs has helped roll back these destructive practices, but other threats loom, including increasingly unpredictable weather and competition from large trawlers.
- A community organization is seeking to have the region zoned as a conservation area.
2021’s top ocean news stories (commentary)
- Marine scientists from the University of California, Santa Barbara, share their list of the top 10 ocean news stories from 2021.
- Hopeful developments this year included big investments pledged for ocean conservation, baby steps toward the reduction of marine plastic pollution, and the description of two new whale species, Rice’s whale (Balaenoptera ricei) and Ramari’s beaked whale (Mesoplodon eueu).
- At the same time, rising ocean temperatures, a byproduct of climate change, had profound effects on marine species up and down the food chain, and action on key measures to maintain ocean resilience in the face of multiple threats hung in the balance.
- This post is a commentary. The views expressed are those of the authors, not necessarily Mongabay.
Wary welcome for Indonesia’s ‘green port’ initiative to clean up shipping
- Indonesia is launching a program to make the country’s ports more environmentally friendly in an effort to reduce its carbon emissions and protect the marine ecosystem.
- The so-called green port initiative will encourage greater use of clean energy and strengthen environmental protection, a top official says.
- Some marine observers in have welcomed the initiative, saying it’s a crucial step toward achieving Indonesia’s emissions reduction target.
- But others say the green port initiative will serve to cover up the environmental impacts of the government’s port-building spree, and will benefit private investors over the general public.
If marine noise pollution is bad, deep-sea mining could add to the cacophony
- A new report suggests that the noise pollution produced by deep-sea mining activities could have far-reaching effects on the marine environment, from surface to seafloor.
- While there are many studies that measure the impacts of noise pollution on marine life, more research is needed to fully understand how sound from deep-sea mining could affect the ocean.
- Due to the paucity of information, experts say a precautionary approach to deep-sea mining noise is required and that clear regulations must be put into place by the International Seabed Authority.
- While deep-sea mining has yet to begin, a subsidiary of Canada-based The Metals Company plans to start mining in less than two years.
With La Niña conditions back, is it good news for tropical forests?
- La Niña conditions have developed across the Pacific Ocean for the second year in a row, according to forecasters at NOAA’s Climate Prediction Center.
- A phase of the El Niño Southern Oscillation ocean-atmosphere cycle, La Niña heralds broadly cooler and wetter conditions across the tropics, with above-average rainfall predicted for important tropical rainforests in Southeast Asia and South America.
- Although the current conditions emerge toward the end of the fire season in the Amazon and Indonesia, experts say these biomes will benefit from wet conditions conducive to forest and peatland growth and recovery.
- Studies indicate that climate change will increase the frequency and severity of La Niña and El Niño events, which will occur against the backdrop of a warmer world, with inevitable implications for natural ecosystems and livelihoods.
Countries fail to agree on Antarctic conservation measures for fifth straight year
- Members of the multilateral body responsible for Antarctic marine conservation failed to agree on new measures to protect the Southern Ocean from overfishing.
- China and Russia blocked all proposals to establish new marine protected areas.
- This story was originally published by the Environmental Reporting Collective.
Hospital waste, not masks, are plastic scourge of pandemic: Study
- A new study has found that 26,000 metric tons of pandemic-related plastic waste has been released into the world’s oceans since the start of the COVID-19 pandemci in January 2020.
- The largest share by far of pandemic-related plastic waste is generated by hospitals, while comparatively smaller amounts are from the improper disposal of face masks, COVID-19 testing kits, and packaging from online shopping activity.
- Besides posing a threat to marine life and humans, mismanaged plastic waste may have the potential to alter Earth’s life-support systems, its dynamics and stability, researchers say.
- Plastic is one of many human-made materials included in the “novel entities” planetary boundary, which is one of nine thresholds beyond which life on Earth could become untenable.
Inland mangroves reveal a tumultuous climatic past — and hint at our future
- A new study concludes that the presence of inland mangroves along a river in southern Mexico was the result of climate change-driven sea level rise during the Pleistocene Epoch, some 115,000 to 130,000 years ago.
- The researchers’ analysis of the genetic history of the mangrove trees suggests that they are closely related to trees found on the coastline, and sediments nearby are similar to those found in ocean environments.
- Publishing their work Oct. 12 in Proceedings of the National Academy of Sciences, the team notes that their research highlights the impacts of global climate change.
Sea turtles: Can these great marine migrators navigate rising human threats?
- Humanity is quickly crossing critical planetary boundaries that threaten sea turtle populations, their ecosystems and, ultimately, the “safe operating space” for human existence.
- Sea turtles have survived millions of years, but marathon migrations put them at increasing risk for the additive impacts of adverse anthropogenic activity on land and at sea, including impacts from biodiversity loss, climate change, ocean acidification, land-use change, pollution (especially plastics), and more.
- The synergistic effects of anthropogenic threats and the return on conservation interventions are largely unknown. But analysts understand that their efforts will need to focus on both nesting beaches and ocean migration routes, while acting on a host of adverse impacts across many of the nine known planetary boundaries.
- Avoiding extinction will require adaptation by turtles and people, and the evolution of new, innovative conservation practices. Key strategies: boosting populations to weather growing threats, rethinking how humanity fishes, studying turtle life cycles (especially at sea), safeguarding habitat, and deeply engaging local communities.
Researchers express alarm as Arctic multiyear sea ice hits record low
- Low sea ice concentration can create a misleading picture of sea ice health in the Arctic. Though extent is only at its 10th lowest since satellite records began in 1979, the waters north of Alaska this September are full of diffuse ice.
- Of great concern to scientists, the Arctic has lost 95% of its thick multiyear sea ice since 1985. Older, thicker ice acts as a buffer against future Blue Ocean Events, expected as early as 2035. A BOE would mark a year when most Arctic ice melts out in summer.
- It no longer takes a freak-weather year to reach near record-lows for extent or volume. 2020 saw a second-place finish in the record book, behind 2012.
The first complete map of the world’s shallow tropical coral reefs is here
- Scientists have completed the first-ever global, high-resolution map of the world’s shallow tropical coral reefs.
- When combined with an integrated tool that tracks global coral bleaching events in near-real-time, the new resource provides a comprehensive overview of the trends and changes in global coral reef health.
- While the completion of the map is an achievement in itself, the scientists behind the Allen Coral Atlas say they hope the new resource will spur action to improve coral reef protection.
- The new mapping platform is already being used to support conservation projects in more than 30 countries, including designation of marine protected areas and to inform marine spatial plans.
Manatee deaths in Florida point to a global decline in seagrass ecosystems
- This year the U.S. state of Florida saw a record number of manatee deaths, and though investigations are still ongoing, experts attribute most of the deaths to the dieback of seagrass, a primary food source.
- The manatee deaths are part of a larger trend: around the world, seagrasses are on the decline, mainly because of increasingly clouded waters due to coastal development.
- Other drivers of this die-off include algal blooms, destructive fishing and boating practices, and the warmer, more acidic waters of climate change.
- There are spots of hope, yet seagrass scientists warn that we are on the brink of losing many of these important wildlife habitats and global carbon sinks.
To save salt marshes, researchers deploy a wide arsenal of techniques
- Salt marshes sequester significant carbon in their sediment — more per hectare than tropical rainforests.
- They protect the land from storm surges and sea level rise, and they shelter a variety of birds, fish and crustaceans.
- However, salt marshes are being lost quickly to erosion and development.
- Governments, institutions and researchers around the world are looking into low-cost ways to protect and restore these vulnerable and valuable habitats.
Seagrass-grazing dugongs and green sea turtles supercharge the seeds they eat
- By consuming and pooping seagrass seeds, dugongs and green turtles play a vital role in maintaining vital, carbon-sequestering seagrass meadows, a new study reveals.
- Scientists working in the Great Barrier Reef found that seagrass seeds germinated up to 60% faster after they had passed through the gut of dugongs or green turtles, and also had two to four times greater germination probability.
- The research highlights the mutual relationship between seagrass and marine mega herbivores, and underscores the shared vulnerability if either party is undermined.
- Experts say we must do what we can to protect dugongs, turtles and other grazing marine animals if we wish to protect seagrass ecosystems and their many benefits.
What can seashells tell us about the health of the oceans?
- On today's episode of the Mongabay Newscast we discuss what seashells can tell us about the state of the world's oceans, and we hear about the challenges facing the Philippines' marine protected area system.
- Environmental journalist Cynthia Barnett joins us to discuss her newly released book, The Sound of the Sea: Seashells and the Fate of the Oceans. She tells us about the many ways humans have prized seashells for years, using them as money, jewelry, and art, and how seashells can help us examine the challenges marine environments are facing today.
- We're also joined by Mongabay staff writer Leilani Chavez, who tells us about the incredible marine biodiversity found in Philippines waters and why there's a movement amongst scientists and conservationists to expand marine conservation efforts beyond the Philippines' extensive coral reef systems.
Humans’ role in climate warming ‘unequivocal,’ IPCC report shows
- The greenhouse gases humans have released into the atmosphere over the past 100 to 150 years has led to a 1.1°C (2°F) rise in global temperatures, according to the Intergovernmental Panel on Climate Change, or IPCC.
- The authors of the IPCC’s latest report use the strongest language yet to connect human activity to climate change, calling the link “unequivocal.”
- The report draws on the findings of thousands of studies, pointing to the need to cut CO2 emissions immediately while also suggesting that many of the impacts of climate change are irreversible.
- This report focuses on the science behind climate change and will be combined with two subsequent reports on the adaptation and vulnerability to the impacts of climate change and ways to mitigate its effects to produce the IPCC’s sixth assessment, scheduled for publication in September 2022.
Coastal Indonesian village adapts to life amid rising tidal floodwaters
- Cars once drove along the road in front of residents’ homes in coastal Timbulsloko village on the northern coast of Indonesia’s Java Island. Now, only canoes can pass; when the tide recedes, the water is knee-deep.
- Timbulsloko experiences severe tidal flooding caused by land subsidence, abrasion, nearby major construction, and climate change.
- Residents are starting to respond: A network of interlocking boardwalks now connects the submerged hamlets to dry land, and the village has designated a protected coastal area and prohibited the clearing of mangroves.
- The goal is to prevent further coastal damage and ensure the safety of residents’ settlements. The community is also beginning to discuss sustainable aquaculture.
As Arctic warms, scientists wrestle with its climate ‘tipping point’
- A leaked version of the newest science report from the U.N. Intergovernmental Panel on Climate Change warns of looming, potentially catastrophic tipping points for Arctic sea ice melt, tundra thaw, savannification of the Amazon rainforest, and other planetary environmental thresholds beyond which recovery may be impossible.
- But what are tipping points, and how does one pinpoint what causes them, or when they will occur? When studying a vast region, like the Arctic, answering these questions becomes dauntingly difficult, as complex positive feedback loops (amplifying climate warming impacts) and negative feedback loops (retarding them) collide with each other.
- In the Arctic, one working definition of a climatic tipping point is when nearly all sea ice disappears in summer, causing a Blue Ocean Event. But attempts to model when a Blue Ocean Event will occur have run up against chaotic and complex feedback loop interactions.
- Among these are behaviors of ocean currents, winds, waves, clouds, snow cover, sea ice shape, permafrost melt, subarctic wildfires, aerosols and more, with many interactions still poorly understood. Some scientists say too much focus is going to tipping points, and research should be going to the “radical uncertainty” of escalating extreme local events.
As Arctic melt sets early July record, hard times lie ahead for ice: Studies
- Arctic sea ice fell to its lowest extent on record for this time of year on July 5, even though the spring had so far been relatively cool and stormy — conditions that, in the past, would have protected the ice.
- Three new studies help explain why. One found that increasing air temperatures and intrusion of warm water from the North Atlantic into the Barents and Kara Seas — a climate change-driven process known as Atlantification — are overpowering the ice’s ability to regrow in winter.
- Another study found that sea ice in coastal areas may be thinning at up to twice the pace previously thought. In three coastal seas — Laptev, Kara, and Chukchi — the rate of coastal ice decline increased by 70%, 98%, and 110% respectively when compared to earlier models.
- A third study found accelerated sea ice loss in the Wandel Sea, pointing to a possible assault by global warming on the Arctic’s Last Ice Area — a last bastion of multi-year sea ice which stretches from Greenland along the Canadian Arctic Archipelago. Combined, this research shows Arctic ice may be in worse trouble than thought.
‘We are intimately connected with nature’: Q&A with oceanographer Kim McCoy
- The third edition of Waves and Beaches, published in March 2021 by Patagonia, examines the dynamic relationship between the sea and coast, blending lyrical prose with the theoretical study of beaches, waves and other oceanographic features.
- This new version of the book, which was published 57 years after the first edition, includes a discussion of how human-induced climate change is altering the dynamics between the sea and land, as well as the possible solutions to protecting coastlines against rising sea levels.
- The book was published as a collaboration between oceanographer Kim McCoy and the late Willard Bascom, the author of the first two editions, who acted as McCoy’s mentor in the years before his death in 2000.
With growing pressures, can the Philippines sustain its marine reserves?
- The Philippines pioneered a community-based approach to marine protected area management in 1974, which balanced conservation and community livelihood. This became the blueprint of the more than 1,500 marine reserves in the country today.
- While the government depends on its MPA system in protecting its seascapes and meeting its international commitments, research suggest only a third of the country’s MPAs are well-managed and only protect around 1% of the country’s coral reefs.
- With management and resource challenges, these MPAs are threatened by overfishing and illegal fishing practices as well as the worsening impacts of climate change.
- Experts say strengthening the country’s larger MPA systems, synchronizing conservation with fisheries management policies, adapting newer models, and creating a network of MPAs may help the country buffer the impacts of climate change on its rich marine resources.
Decades of research back the value of marine reserves to Kenya’s fisheries
- A 24-year study conducted by Tim McClanahan looked at two different interventions to address unsustainable fishing practices in artisanal fisheries along Kenya’s coast: gear restrictions, and a marine reserve that prohibited all fishing activities.
- It found both methods showed an increase of catch per unit effort (CPUE), which indirectly measures the number of target species that were caught.
- Landing sites adjacent to the marine reserve maintained steady total yields, while the gear-restricted sites declined over the study period.
- While marine reserves were shown to generate more long-term benefits, outside experts say they are not always an ideal solution and that other approaches may be more appropriate in managing fisheries.
Climate change isn’t fueling algal blooms the way we think, study shows
- A team of international researchers recently published the first global assessment of harmful algal blooms (HABs) — events in which toxic algae proliferate and cause harm to marine life and humans — based on nearly 10,000 recorded events between 1985 and 2018.
- The study found that there are no global trends that would suggest that climate change is having a uniform impact on HABs throughout the world, although this is a commonly held belief.
- The researchers were able to detect clearer regional trends that showed increases, decreases or no significant changes in HABs in certain parts of the world.
- It also found that there was a perceived increase in HABs amid the booming aquaculture industry, although the study does not necessarily suggest that aquaculture is causing an increase in HABs.
Scientists call for solving climate and biodiversity crises together
- A new report from United Nations’ Intergovernmental Panel on Climate Change (IPCC) and the Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services (IPBES) highlights the importance of confronting climate change and biodiversity loss together.
- Global climate change and the unprecedented loss of species currently underway result from a similar suite of human-driven causes, the report’s authors write.
- As a result, solutions that take both issues into account have the best chance of success, they conclude.
New Attenborough film sounds alarm on planetary boundaries, but offers hope
- A newly released Netflix documentary, “Breaking Boundaries: The Science of Our Planet,” features David Attenborough and Johan Rockström, one of the scientists who introduced the concept of planetary boundaries.
- Planetary boundaries are Earth system processes essential for the planet’s functioning but have an environmental limit to which they can tolerate changes.
- According to experts, if these limits are transgressed, the Earth can be pushed into a new, dangerous state.
- While the film suggests that the planet requires urgent repair, it also offers a clear path forward — and a message of hope.
Satellites keep watch over global reef health in a world first
- Scientists working with the Allen Coral Atlas just launched the world’s first global, satellite-based reef-monitoring system.
- This tool can track global coral bleaching events in near-real-time and provide an overall view of trends and changes in coral reef health that can be used to inform conservation efforts and policy.
- A beta version of the system that was piloted in Hawai‘i during the 2019 Pacific heat wave, and helped identify bleaching hotspots as well as resilient corals that could be used for reef restoration.
Reversing warming quickly could prevent worst climate change effects: Study
- Irreversible and catastrophic environmental tipping points could still be avoided, even if we exceed global emission reduction targets — provided the world is able to reverse overshoot quickly, according to researchers.
- Simple mathematical models of four earth system tipping elements reveal a lag between overshooting the threshold and irreversible change. “Slow-onset” elements like icecap melt operate on century-long timescales, while Amazon dieback could pass a point of no return in just decades.
- However, experts warn that the models fail to take interactions between different tipping elements into account, which could shorten the amount of time a threshold can be overshot. Many of these interactions are poorly understood, making them difficult to include in climate models.
- Researchers say these results show there is still good reason to take action to mitigate global warming, even if we do overshoot the Paris Agreement target of 1.5°C. Some warn the study results could be used as an excuse to tolerate further delays on global climate action.
Ocean protection scheme can yield ‘triple benefits’ study says
- A new study suggests that carefully planned marine protected areas could yield triple benefits for the ocean, helping to maintain biodiversity, while also increasing fish yields and maximizing the ocean’s ability to sequester carbon in seafloor sediment.
- This study is one of the first to quantify the carbon footprint of ocean trawling, which it equates to the yearly emissions of the global aviation industry.
- The researchers suggest that the planning tools in this study could help inform discussions about how to protect 30% of the oceans by 2030, a goal that is expected to be adopted by the U.N. Convention on Biological Diversity later this year.
- Other proposals for how to achieve 30% protection by 2030 have mostly focused on the high seas, but this plan takes all parts of the ocean into consideration.
Oceans helped absorb our CFCs. They’re now going to emit them back out
- A new study suggests the ocean will begin emitting CFC-11 by about 2075, and that there will be detectable amounts of the chemical in the atmosphere in the first part of the 22nd century.
- Climate change will likely exacerbate the process, turning the ocean into a source of CFC-11 earlier than expected.
- Since the Montreal Protocol was signed in 1987, CFC-11 emissions have sharply dropped, but some studies have found that there is still a small amount of CFC-11 being released into the atmosphere each year.
- While the ozone layer is currently not threatened on a global level, experts say that more research is needed to understand future threats.
As Arctic sea ice hits annual maximum, concern grows over polar ice loss: Studies
- Arctic sea ice reaches its annual maximum extent in March. But while ice extent is high this year, scientists are far more concerned by the drastic loss of sea ice volume, which continues its steady decline.
- A new study has documented drastic ice loss in both the north and south polar regions; scientists found that the single biggest reduction came from Arctic sea ice — the Earth lost 7.6 trillion metric tons of it in the last three decades.
- Another new study shows that the last bastion of old, thick multiyear ice in the Arctic, north of Greenland and Ellesmere Island, is diminishing as the stability of the Nares ice arches declines — blockages which work like a cork in a bottle to stop multiyear ice from flowing out into the Atlantic.
- Meanwhile, researchers warn about the urgent need for new Arctic monitoring satellites. Currently there is just one in operation, the DMSP-F18 satellite, and it has already been in orbit more than a decade. Its failure could leave researchers blind and disrupt an Arctic ice database continuous back to 1978.
New age of sail looks to slash massive maritime carbon emissions
- If ocean shipping were a country, it would be the sixth-largest carbon emitter, releasing more CO2 annually than Germany. International shipping accounts for about 2.2% of all global greenhouse gas emissions, according to the U.N. International Maritime Organization.
- But change is on the way. Wind, solar electric, and hydrogen-powered ships offer innovative low- or no-carbon alternatives to fossil fuel-powered cargo vessels, with wind about to make a huge comeback in shipping, say experts. New experimental sail designs include hard sails, rotating vertical cylinders, and even kites.
- Today, startup companies like Fair Transport (with its retrofitted wooden vessels Tres Hombres and Nordlys); modest sized proof-of-concept firms, with purpose-built vessels like Grain de Sail; and large cargo ship retrofits and purpose-built vessels like Neoline’s new large cargo vessels, are starting to address CO2 emissions.
- Through the late 1940s, huge steel sailing ships carried cargos on some ocean routes. By 2030 — less than 100 years since the end of the last great era of sail — fossil fuel-powered cargo vessels may give way to high- and (s)low-tech sailing ships thanks to a revolution in energy technology, that reduces shipping costs with less emissions.
U.N. report lays out blueprint to end ‘suicidal war on nature’
- According to a new report from the United Nations Environmental Programme, the world faces three environmental “emergencies”: climate change, biodiversity loss, and air and water pollution.
- U.N. Secretary-General António Guterres said we should view nature as “an ally,” not a foe, in the quest for sustainable human development.
- The report draws on assessments that quantify carbon emissions, species loss and pollutant flows to produce what the authors call concrete actions by governments, private companies and individuals that will help address these issues.
New study warns that sea levels will rise faster than expected
- A new study has found that sea level rise may happen faster than current models project.
- The Intergovernmental Panel on Climate Change (IPCC) projects that the sea level will rise about a meter (39 inches) by the century’s end, but this study finds that estimate to be conservative.
- The results suggest that sea levels will rise about 25 centimeters (10 in) more per century if carbon emissions are not curbed and the Earth continues to heat up.
Activists make the case that bigger is better to protect Galápagos reserve
- A group of scientists, conservationists and NGOs are campaigning to expand the current Galápagos Marine Reserve to protect an additional 445,953 square kilometers (172,183 square miles) in the exclusive economic zone of the Galápagos Islands.
- According to a scientific proposal, the marine reserve expansion would help protect threatened migratory species, deter unsustainable and illegal fishing practices, and even bolster the legal Ecuadoran fishing industries.
- While the proposal has garnered both national and international support, Ecuador’s fishing sector is largely opposed to the expansion of the reserve.
Seven financial firms key to rooting out deforestation, report finds
- Exchange-traded funds (ETFs) and index funds are some of the most popular investment tools available, popular among individual and institutional investors alike.
- Just a handful of asset management firms control between 60% and 70% of these funds, according to a recent report from the financial think tank Planet Tracker.
- Planet Tracker’s analysis found that $9.3 billion from ETFs is invested in a set of 26 companies engaged in the soybean trade and linked to deforestation.
- The report concludes that the financial firms in which ETFs and index funds are concentrated are critical in addressing financial support for deforestation.
2020’s top ocean news stories (commentary)
- Marine scientists from the University of California, Santa Barbara, share their list of the top 10 ocean news stories from 2020.
- Hopeful developments this year included some long-overdue attention to Black and other underrepresented groups in marine science; new technologies to prevent deadly ship-whale collisions and track “dark” vessels at sea remotely; and surprising discoveries in the deep sea.
- At the same time, the COVID-19 pandemic resulted in more trash than ever being dumped in the sea, and stalled international negotiations aimed at protecting waters off Antarctica and in the high seas. 2020 also brought the first modern-day marine fish extinction.
- This post is a commentary. The views expressed are those of the authors, not necessarily Mongabay.
The crypto-creature from the deep: Researchers get rare video of bigfin squid
- Five squids from the Magnapinna genus, known as bigfins for their distinctive flappy fins, were spotted in deep-sea surveys over the course of three years off southern Australia.
- These cephalopods are usually found thousands of meters under the sea’s surface, in underexplored waters across the globe.
- To date, however, not a single adult specimen has been captured, and sightings are uncommon, making the newly obtained survey videos a rare window into their mysterious lives.
- Scientists believe that despite the remoteness of their habitats, these understudied creatures could still be susceptible to the impacts of a changing climate.
Frustration as Antarctic conservation summit fails to declare marine sanctuaries
- A proposition to establish three new marine protected areas (MPAs) in East Antarctica, the Antarctic Peninsula and the Weddell Sea was not approved at a recent meeting of the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR), which was held online in the last week of October.
- Conservation experts who attended the meeting reported there was limited time for negotiations, and that discussions focused more on fishing renewal authorizations and the issue of a Russian vessel suspected of illegally fishing, rather than the MPA designations and climate change action.
- On the other hand, many delegates signed a pledge of support for the formation of the three MPAs, and the Weddel Sea MPA and East Antarctica MPA gained new co-sponsors.
Brave New Arctic: Sea ice has yet to form off of Siberia, worrying scientists
- After a summer that saw record Siberian fires and polar temperatures topping 100 degrees Fahrenheit, along with near record low sea ice extent in September, the Arctic Ocean’s refreeze has slowed to a crawl.
- The Laptev Sea and East Siberian Sea are, at this point, failing to re-freeze as rapidly as in the past. Scientists see all of these worrying events, along with many other indicators including fast melting permafrost, as harbingers of a northern polar region that may be entering a new climate regime.
- Models predict the Arctic will be ice-free in summer by 2040 or 2050, with unforeseen negative impacts not only in the Far North, but on people, economies and ecosystems around the globe. One major concern: scientists worry how changes in the Arctic might alter temperate weather systems, impacting global food security.
- “We’re conducting this blind experiment, and we don’t yet know the real implications,” one sea ice researcher tells Mongabay. “How do you sell climate change to be as much of an emergency as COVID-19? Except that it will kill a lot more people.”
‘No other choice’: Groups push to protect vast swaths of Antarctic seas
- A coalition of conservation groups is advocating for the establishment of three new marine protected areas (MPAs) in East Antarctica, the Antarctic Peninsula and the Weddell Sea, which would encompass 4 million square kilometers (1.5 million square miles) of the Southern Ocean, or 1% of the global ocean.
- These proposals will be discussed at an upcoming meeting of the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR), which is due to take place online because of the pandemic.
- Conservationists anticipate that China and Russia may not support these MPA proposals due to fishing interests in the region, although they are optimistic that the MPAs will eventually be approved.
Blooms driven by climate change threaten to smother marine life in Arabian Sea
- A strange single-celled organism that acts both as a plant and an animal has come to dominate wintertime algal blooms in the northern Arabian Sea.
- Winter blooms of Noctiluca scintillans, also known as the sea sparkle, have displaced microscopic algae called diatoms that form the basis of the marine food chain, a paper in Nature says.
- Scientists at Columbia University fear the outbreaks could herald massive declines in fisheries in the region, potentially impacting millions of fishers in India, Pakistan, Iran, Oman and Yemen.
- They have linked the emergence of N. scintillans blooms with the loss of ice cover in the Himalayan-Tibetan Plateau driven by climate change.
Can the planet support a clean energy transition?
- Combating climate change will require rapidly deploying renewable energy while reducing our use of fossil fuels. But renewable energy technologies like wind turbines, solar panels, batteries, and electric vehicles require large amounts of mined metals and minerals.
- That poses a problem, because the mining process creates significant environmental impacts, from air and water pollution to deforestation, and has led to numerous conflicts with local communities. And now, there's a concerted effort underway by the mining industry to open up vast areas of the ocean floor to minerals mining. If we’re not careful about how we meet the growing demand for minerals, it could actually imperil the promises of the transition to clean energy.
- To help us dive into all of this, we speak with Ian Morse, a journalist who follows the minerals mining and clean energy beat closely. We also speak with Catherine Coumans of MiningWatch Canada, who discusses the threats posed by deep sea mining and tells us why more mining may not be the best way to meet the demand for minerals.
Arctic Sea ice melts to second-place finish at annual minimum
- At the annual September Arctic sea ice minimum this year, the ice extent was reduced to just 3.74 million square kilometers, a low that surpassed every year since 1979 except 2012, which saw a minimum of 3.41 million square kilometers.
- While 2012 was an anomaly (a year in which an immense August cyclone shattered the weakened ice), 2020 came very close to that record, but without any such storm, though the region did see intense July and August heat.
- A new study finds, once again, that what starts in the Arctic doesn’t stay there. Researchers say that Asia is seeing lengthier bouts of extreme storms, droughts, heat and cold as weather systems stall there, possibly due to a weakening Northern Hemisphere jet stream — an effect thought to be due to Arctic warming.
- In other new research, scientists say a layer of warm Atlantic water entering the Arctic, which had always stayed down deep in the past, is starting to rise toward, and mix with, colder surface waters. That mixing could be fatal to the Arctic sea ice in the future — with unknown, but potentially dire impacts on global climate stability.
Hawaiian reefs lost almost half their fish to pollution and fishing
- A new study has found a 45% decline in the biomass of important fish species in West Hawai‘i’s reefs across a 10-year period.
- According to the research, sewage pollution was the biggest contributor to declining fish biomass; spearfishing, collection for the aquarium trade, and fishing using lay nets followed closely behind.
- The study will inform new management practices to protect Hawai‘i’s coral reefs, including the state’s 30 by 30 initiative, which aims to designate 30% of Hawai‘i’s nearshore waters as marine protected areas by 2030.
In Brazil, human action and climate change are drowning a community
- In the old seaside resort of Atafona on the coast of Rio de Janeiro, the Atlantic Ocean has been destroying streets, houses and businesses for more than 50 years, claiming at least 500 buildings.
- The damming of the Paraíba do Sul River and destruction of forests along its banks are seen as factors in the river’s silting and throttled water flow, which has allowed the sea to advance up the mouth of the river where Atafona is located.
- According to researchers, climate change is speeding up the rate of coastal erosion through increased frequency and intensity of extreme surges and storms; in Atafona, the sea advances 3 meters (10 feet) a year.
- According to the International Organization for Migration, environmental impacts displaced 295,000 people were in Brazil in 2019; worldwide, the figure exceeds that of displacements caused by internal conflicts.
App harnesses citizen power to keep tabs on Philippines’ coral reefs
- A series of coral bleaching events have affected reefs across the Philippines in previous years, and this year alone 11 such incidents have been reported.
- But bleached reefs aren’t necessarily dead, with some still able to recover if they are resilient enough and if no further stressors come into play.
- Given that the Philippines has an estimated 33,500 square kilometers (nearly 13,000 square miles) of reefs, a volunteer group is relying on a small but growing army of citizen scientists to keep track of these bleaching incidents by submitting photos online or through an app.
- Citizen science could also help identify other threats to coral reefs, including crown-of-thorns infestation and disease outbreaks, as well as identify corals that are more resilient.
As reef bleaching intensifies, lab-grown corals could help beat the heat
- The Great Barrier Reef suffered its third major coral bleaching event since 2016 this past March, with scientists saying the extent of the damage was far greater this time.
- Up to 60% of the reef was affected in the latest bleaching, which occurs when warming waters force the corals to flush out their life-giving algae.
- But scientists say they’re encouraged by the results of ongoing lab research to create “enhanced” corals, gene-edited to make them more resilient to rising water temperatures.
- Lab and field tests show the hybrid corals have up to 26 times better heat tolerance, which would make them ideal candidates for repopulating bleached reefs.
Sea temperature a critical factor in success of coral reef outplants
- As the world’s coral reef systems decline due to mass bleaching events and other stressors, coral reef gardening or outplanting, the practice of growing coral fragments and planting them on ailing reefs, is being used to restore reefs.
- A new study finds that the survival of coral reef outplants dropped below 50% if the sea surface temperature rose above 30.5° Celsius (89.6° Fahrenheit).
- Coral outplants were also more likely to survive in marine environments with variable temperatures, which might increase their resilience to temperature change, according to the authors.
- Ocean warming is projected to continue to increase, so choosing appropriate coral outplant sites based on temperature will help ensure the success of coral restoration projects, the study suggests.
Climate conundrum: Could COVID-19 be linked to early Arctic ice melt?
- The COVID-19 pandemic has yielded unexpected environmental benefits, as wildlife explore urban streets and 2020 carbon emissions drop by the largest amount since World War II. But now researchers are wondering if a record hot and sunny start to the Arctic sea ice melt season could be linked to the Coronavirus lockdown.
- The possible cause: a reduction in atmospheric sulphate aerosol pollutants emitted by factories, ships and other sources. Sulphate aerosols increase the amount of clouds and brighten the atmosphere, reflecting more solar heat, thus masking global warming intensity — and making the Arctic cloudier and colder.
- Scientists are working to determine if, and by how much, sulphate aerosols have declined due to the industrial slowdown brought by the COVID-19 pandemic.
- These figures could help them more precisely determine how aerosols have been inhibiting atmospheric heating around the world, especially in the Arctic. One study found that sulphate aerosol-seeded clouds could be masking about a third of all warming from greenhouse gases. However, the question is far from settled.
Economists put a price tag on living whales in Brazil: $82 billion
- Last year, a team of four economists published a report suggesting that living whales have a high market value for the services they provide in terms of ecotourism, carbon sequestration, and fishery enhancement. Each whale is worth about $2 million USD, they estimated.
- The economists, in collaboration with two conservation organizations, Instituto Baleia Jubarte and the Great Whale Conservancy, estimated that Brazil’s whale population is worth $82 billion.
- The team says it hopes the notion of valuing whales in Brazil, as well as in other coastal nations, can help protect whales from common fatalities like ship strikes, fishing gear entanglement, and deliberate hunting.
Philippines bids farewell to satellite that launched enviro policy into the space age
- Diwata-1, the Philippines’ first microsatellite, has ended its four years in Earth orbit, burning up in the atmosphere on April 6.
- The microsatellite captured more than 17,000 images of the Philippines, covering 38% of the country’s land area.
- Diwata-1 ushered in an age of Earth satellite observation in the Philippines, contributing to science-based approaches to planning, conservation, risk management, and mapping.
- Scientists involved in the program say they hope that analyses and reports culled from the country’s Earth observation technology can help in policymaking and decision-making.
Climate change makes some fish smaller, and others bigger, study finds
- A decades-long study finds that fish either increase or decrease in size in response to climate change-induced warming water, with smaller fish generally getting smaller, and larger fish generally getting bigger.
- Fish species changed size more rapidly in response to climate change, by nearly 20% for every 0.5° Celsius (0.9° Fahrenheit) of warming.
- Fluctuations in fish size could have a serious impact on the marine food web, such as making certain species more susceptible to predation.
Ocean deoxygenation could be silently killing coral reefs, scientists say
- A new perspective paper argues that ocean deoxygenation is the biggest threat to coral reef survival, perhaps even more so than warming sea temperatures and acidification.
- Oxygen in the world’s oceans has decreased by 2% since the middle of the last century, due largely to climate change, agricultural runoff and human waste.
- A growing body of work examines deoxygenation in the open ocean, but little research has been done on the effects of decreased oxygen on coastal coral reefs systems in tropical environments, and this paper begins filling that gap.
- The lead author and his colleagues are currently collecting data off the coast of Heron Island on the Great Barrier Reef to understand the effects of deoxygenation on the surrounding reefs.
Ocean optimism: Study says we can restore marine health
- A new study finds that it’s possible to repair the world’s oceans to a substantial level in three decades, as long as appropriate measures are taken to protect vulnerable marine species and habitats, rebuild damaged ecosystems, and alleviate the pressures of climate change.
- Several models of success are used to demonstrate that repairing the oceans is a realistic goal, including the positive impacts of wildlife trade and hunting regulations to protect endangered species and critical habitats.
- The biggest challenge in reinstating global ocean health is mitigating the effects of climate change, the authors say.
Great Barrier Reef suffers biggest bleaching event yet
- Australia’s Great Barrier Reef just experienced its third major bleaching event in the past five years, which has caused severe and widespread damage.
- The Australian Bureau of Meteorology (BOM) recorded its highest ever sea temperature this past February, which triggered the bleaching.
- The southern part of the reef, which remained relatively untouched during large bleaching events in 2016 and 2017, suffered the most acute damage this time.
- While some corals are able to recover from bleaching, this process can take more than a decade, and scientists fear the Great Barrier Reef won’t recover.
Game changer? Antarctic ice melt related to tropical weather shifts: Study
- Scientists predominantly believe that the tropics have the largest influence on global weather. Now, new research suggests that the melting of Antarctic sea ice could impact places as far away as the equator.
- In one of the first studies to look at the link between Antarctic sea ice and tropical weather patterns, researchers found that melting sea ice in Antarctica is likely warming ocean surface temperatures, delivering more rain, and potentially creating El Niño-like effects in the equatorial Pacific.
- Earlier this year, another study found that accelerating sea ice melt in the Arctic could be linked to the intensification of Central Pacific trade winds, the emergence of El Niño events, and the weakening of the North Pacific-Aleutian Low Circulation. So it may be that Arctic and Antarctic changes are synergistically impacting the tropics.
- It’s expected that ice loss at both poles will combine to warm the equatorial Pacific surface ocean by 0.5℃ (0.9℉) and increase rain by more than 0.3 millimeters (0.01 inches) of rain per day in the region.
For nesting hawksbill turtles, this Philippine community is a sanctuary
- For centuries, hawksbill sea turtles have returned to a shoreline in the eastern Philippines to lay their eggs, even as the human community has expanded along the same stretch of beach.
- Hawksbill sea turtles’ low survival rates in the wild are caused by natural predators and, recently, exacerbated by rising sea levels. Another key threat is poaching for their meat and shells.
- Despite the lack of financial support, locals continue to look after the eggs, coming up with their own ways to protect them until the hatchlings are ready to be released back into the sea.
Songs and sounds of Bering Sea whales and seals reveal a story of change
- On today’s episode of the Mongabay Newscast, we listen to recordings of marine mammals in the Arctic with Dr. Howard Rosenbaum, the director of the Wildlife Conservation Society’s Ocean Giants Program.
- Rosenbaum co-authored a recent study that used bioacoustics to better understand how seasonal variation in sea surface temperatures and sea ice extent affect populations of five species of endemic Arctic marine mammals: bearded seals, beluga whales, bowhead whales, ribbon seals, and walrus.
- We listen to recordings of marine mammals used in the study as well as recordings of ships: Rosenbaum joins us to discuss how those ship sounds can affect Arctic wildlife and how the results of the study will help scientists track the impacts of climate change on Arctic ecosystems.
New right whale protection measures announced by Canadian government
- Canada has announced new protection measures for North Atlantic right whales, which face severe threats to their survival due to human activities off the Atlantic Coast of North America.
- Most recent right whale deaths have occurred in Canadian waters, which scientists attribute, at least partly, to the fact that the whales have moved into areas where there were no regulations in place to address threats like ship strikes and entanglement.
- Scientists say the new regulations proposed by the Canadian government are encouraging. Meanwhile, if the Trump Administration gets its way, the United States will be moving in the exact opposite direction on protections for whales in its waters.
East Africa’s reefs being fished at unsustainable rates, study finds
- A new study shows that fish stocks in coral reefs along the coast of East Africa have been fished to worryingly low levels, with 70% below sustainable levels.
- The findings are a best-case scenario; computer models suggest stocks could be much lower.
- The study’s author calls for more careful regulation of fisheries in East Africa to allow stocks to recover — contrary to the current push for expansion of the fisheries sector.
Climate fix? ‘Fertilizing’ oceans with iron unlikely to sequester more carbon
- Since the 1980s, scientists have studied whether adding iron to the oceans might represent a relatively simple and inexpensive solution to climate change.
- The idea is that adding iron would encourage the growth of carbon-munching marine phytoplankton that would pull carbon out of the atmosphere on a global scale.
- But a new study by researchers at the Massachusetts Institute of Technology suggests that iron fertilization, as the process is called, is unlikely to work.
Listening to marine mammals is helping scientists understand Arctic impacts of climate change
- A 4-year bioacoustic study of marine mammals in the northern Bering Sea will help scientists track the impacts of global climate change on Arctic ecosystems.
- A team of researchers studied how seasonal variation in sea surface temperatures and sea ice extent affect populations of five species of endemic Arctic marine mammals: bearded seals (Erignathus barbatus), beluga whales (Delphinapterus leucas), bowhead whales (Balaena mysticetus), ribbon seals (Histriophoca fasciata), and walrus (Odobenus rosmarus).
- The researchers captured more than 33,000 individual vocalizations from whales, walruses, and seals over the course of the study, which was conducted between 2012 and 2016. They say that their findings showed consistent seasonal distribution and movement patterns for most of the studied species, supporting previous scientific and traditional knowledge about the distribution of marine mammals in the northern Bering Sea, while providing more precise data than was previously available.
Managing fisheries helps stocks recover — most of the time
- A recent study, representing 49% of the fish landed between 1990 and 2016, reveals that, on average, fish stocks are healthy where intensive fisheries management is implemented.
- The research demonstrates that managing fish populations with robust scientific data has helped turn the tide against overfishing in places around the world where it is practiced.
- But disagreements between scientists exist over whether other strategies, such as marine protected areas, should complement fisheries management in an effort to protect life in the world’s oceans.
Melting Arctic sea ice may be altering winds, weather at equator: study
- Scientists predominantly believe that the tropics have the largest influence on global weather, but new research suggests that climate change-driven Arctic heating and rapid melting of Arctic sea ice could impact places as far away as the equator.
- A new study, published today, found that accelerating ice melt in recent decades could be linked to Central Pacific trade wind intensification, the emergence of El Niño events, and a weakening of the North Pacific Aleutian Low Circulation — a semi-permanent low pressure system that drives post-tropical cyclones and generates strong storms.
- A 2019 study likewise revealed a close connection between winter Arctic ice concentration over the Greenland-Barents Seas and the El-Niño-Southern Oscillation (ENSO) in the following winter. Another study out this month found that in prehistoric times, periods of major permafrost thawing were tied to an absence of Arctic summer sea ice.
- Other research has drawn connections between rising Arctic temperatures and changes in the jet stream — a fast-moving river of air that circles the northern polar region. A slowing of the jet stream, and its looping far to the south, is thought to be stalling temperate weather patterns, worsening droughts, storms and other extreme weather.
2019 was second-hottest year on record, 2010s hottest decade
- Global average temperatures on land and at sea in December 2019 were the second-highest recorded in the month of December since record-keeping began in 1880. That capped off a year that will also go down as the second-hottest on record, according to data released by the US National Oceanic and Atmospheric Administration (NOAA) today.
- The average temperature across Earth’s land and ocean surfaces in 2019 was 1.71°Fahrenheit or 0.95°Celsius above the 20th-century average, NOAA reports, just 0.07°F or 0.04°C below the hottest year on record, 2016.
- A separate analysis by NASA scientists confirmed 2019 as the second-warmest year on record. Earth’s average global surface temperature is now more than 2 degrees Fahrenheit, or slightly more than 1 degree Celsius, higher than it was in the late 19th century, NASA reported.
2019’s top 10 ocean news stories (commentary)
- Marine scientists from the University of California, Santa Barbara, share their list of the top 10 ocean news stories from 2019.
- Hopeful developments included progress toward an international treaty to protect biodiversity on the high seas and a rebound in the western South Atlantic humpback whale (Megaptera novaeangliae) to nearly its pre-whaling population size.
- Meanwhile, research documenting rapidly unfurling effects of climate change in the ocean painted a dire picture of the present and future ocean. These include accelerating sea level rise, more severe marine heatwaves and more frequent coral bleaching events.
- This post is a commentary. The views expressed are those of the authors, not necessarily Mongabay.
10 noteworthy books on conservation and the environment from 2019
- 2019 produced a number of notable books on the environment, ranging from the memoirs of researchers and journalists to how-to guides and prescient novels.
- Here’s a sample of what was published in the past year.
- They cut across a variety of environment-related themes, though climate change is a common point of meditation for many of the authors on the list.
- Inclusion on this list does not imply Mongabay’s endorsement of a book’s content; the views in the books are those of the authors and not necessarily Mongabay.
Vanishing sea ice in the Arctic could shake up seabird migrations
- Researchers have developed a framework to aid in understanding the changes to seabird migration that could result from the loss of Arctic sea ice due to climate change.
- The team found that one species, the little auk, would expend about half as much energy by shifting its migration from the North Atlantic to the North Pacific, rather than their traditional migration or if they just stayed put in the high Arctic.
- The team also mined the scientific literature and found 29 bird species with the potential for a similar shift in their migratory routes.
Canaries in the coal mine? North Atlantic right whale use of key habitat changing rapidly
- A team of researchers with the Center for Conservation Bioacoustics at the Cornell Lab of Ornithology and Syracuse University recently published the results of a six-year study that focused on the North Atlantic right whales (Eubalaena glacialis) in Massachusetts Bay, which, together with Cape Cod Bay, comprises one of seven areas in the Gulf of Maine that the whales use during seasonal congregations.
- The team used an automated detection algorithm to determine the presence of right whale “up‐calls” in 47,000 hours of recordings made with 19 bioacoustic recording devices deployed across 4,000 square kilometers (about 1,544 square miles) of Massachusetts Bay.
- The number of whales present during the peak season increased every year of the study except for 2009-2010, “when acoustic presence was unusually low,” according to the study. But the researchers also detected an increased presence of right whales during parts of what should be their off‐season, from late summer to early fall. That could have serious implications for efforts to conserve the species.
Protecting living corals could help defend the Great Barrier Reef from ocean acidification for decades
- For the first time, researchers have studied the impact of ocean acidification on coral reefs with a device that allows them to increase levels of carbon dioxide on living coral for months at a time.
- Corals exposed to higher levels of carbon dioxide sustained more damage than those in aquarium experiments because fish, sponges, and other native organisms grazed on the fragile reefs.
- However, living corals were more resilient than scientists expected, providing a promising buffer against the impacts of climate change.
World is fast losing its cool: Polar regions in deep trouble, say scientists
- As representatives of the world’s nations gather in Madrid at COP 25 this week to discuss global warming policy, a comprehensive new report shows how climate change is disproportionately affecting the Arctic and Antarctic — the Arctic especially is warming tremendously faster than the rest of the world.
- If the planet sees a rise in average temperatures of 2 degrees Celsius, the polar regions will be the hardest hit ecosystems on earth, according to researchers, bringing drastic changes to the region. By the time the lower latitudes hit that mark, it’s projected the Arctic will see temperature increases of 4 degrees Celsius.
- In fact, polar regions are already seeing quickening sea ice melt, permafrost thaws, record wildfires, ice shelves calving, and impacts on cold-adapted species — ranging from Arctic polar bears to Antarctic penguins. What starts in cold areas doesn’t stay there: sea level rise and temperate extreme weather are both linked to polar events.
- The only way out of the trends escalating toward a climate catastrophe at the poles, say scientists, is for nations to begin aggressively reducing greenhouse gas emissions now and embracing sustainable green energy technologies and policies. It remains to be seen whether the negotiators at COP 25 will embrace such solutions.
Warming of Indo-Pacific waters disrupting weather worldwide, report finds
- As the latest U.N. climate change summit gets underway in Madrid, a paper published in Nature has drawn attention to the disruptive impact of warming oceans on the weather.
- It examines the effect of a swath of warm water in the Indo-Pacific Ocean, which has doubled in size since the turn of the 20th century, on the Madden-Julian Oscillation (MJO), a system of rain-bearing clouds, winds and pressure fronts that traverses eastward along the equator.
- The MJO affects the timing variability and strength of rainfall in many parts of the world, regulating among other things cyclone formation, the monsoon system, and the El Niño cycles.
- Changes in the amount of time the system lingers over a region, influenced by the expansion of the warm water pool in the Indo-Pacific, has caused disruptions in rainfall in Asia, Africa, Australia and the Americas.
Shrinking sea ice in the Arctic opens new pathways for animal disease
- Scientists have discovered that periods of minimal sea ice in the Arctic between 2001 and 2016 were followed by spikes in a deadly disease that affects seals, sea lions and sea otters.
- The team used satellite imagery showing decreases in sea ice combined with GPS collar data tracking animal movements over the 15-year study period.
- After periods of sea ice contraction, the odds that a sampled animal would be affected by the disease were more than nine times higher than typical years.
What’s at stake after Chile cancels its hosting of COP25?
- Massive protests triggered by social unrest over economic, justice and environmental issues have forced Chile to cancel its hosting of this year’s U.N. climate change summit in December.
- As the organizer of the 25th Conference of Parties, Chile was to have led the effort to bolster ambitions in the fight against climate change aimed at ensuring that global temperatures don’t increase by more than 1.5 degrees Celsius (2.7 degrees Fahrenheit) above pre-industrial levels.
- On Oct. 31, a day after Chile’s president announced the cancellation, Spain offered to hold the conference on the scheduled dates, Dec. 2-13, in Madrid.
Commitments worth $63 billion pledged for ocean protection
- The sixth annual Our Ocean conference took place in Oslo, Norway, on Oct. 23 and 24.
- Governments, businesses, organizations and research institutions made 370 commitments toward improving marine health and productivity that were worth more than $63 billion.
- The commitments, a considerable boost from the $10 billion committed last year, reflect a new level of urgency around ocean protection as its role in mitigating climate change becomes ever clearer.
- Focus areas of the conference included building the sustainability of the global fishing industry and reducing plastic pollution.
Once close to extinction, western South Atlantic humpback population close to full recovery
- According to a study published in the journal Royal Society Open Science last week, there were nearly 27,000 western South Atlantic humpbacks as of 1830, but the population was reduced by some 95 percent, to just 450 whales, by the mid-1950s. In the 12 years between 1904 and 1916 alone, the population lost approximately 25,000 individuals.
- Protection measures for humpbacks adopted in the 1960s and the broader moratorium on all commercial whaling adopted by the International Whaling Commission (IWC) in the 1980s appear to have reversed that downward trajectory, however. There has been no hunting of the species since 1972, the report states, which is when the recovery really took off.
- “Once protected, [western South Atlantic] humpback whales have recovered strongly, and their current abundance is close to 25,000 whales,” the authors of the study write. That means that the current population is estimated to be at 93 percent of its numbers prior to the exploitation by whalers that nearly extirpated the entire population.
Study finds massive reorganization of life across Earth’s ecosystems
- A new study pulls together data from 239 studies that looked at more than 50,000 biodiversity time series.
- The research reveals that almost 30 percent of all species are being swapped out for other species every 10 years.
- The scientists found that the reorganization and loss of species are happening much more quickly in some environments than in others, a finding that could help inform future conservation.
For the Philippines, a warming world means stronger typhoons, fewer fish
- Global warming is expected to increase the frequency of El Niño and La Niña weather events in the Pacific, resulting in more powerful typhoons hitting the Philippines, according to the latest report from the Intergovernmental Panel on Climate Change.
- The report’s authors warn that even under a low-carbon-emission scenario, such extreme weather events are inevitable.
- The Philippines also has to contend with warming ocean waters that threaten to kill its coral reefs and drive its once-plentiful fish stocks to cooler regions of the Pacific.
- The IPCC authors say more research is needed to better understand how ocean warming will impact the Philippines and the wider region.
IPCC special report finds oceans and cryosphere changing rapidly due to global warming
- As a massive expanse of unusually warm water spreads across the northeastern Pacific Ocean for the second time in the past five years, the latest special report from the Intergovernmental Panel on Climate Change (IPCC), released today, finds that marine heatwaves have “very likely” become twice as frequent and increasingly intense over the past four decades.
- The report focuses on the benefits of taking action to limit global warming — and the costs of delaying that action — for the world’s oceans and cryosphere (the parts of Earth’s surface that are frozen, such as ice sheets and frozen ground). It is the work of more than 100 authors from 36 countries who assessed 7,000 scientific publications to assemble the latest scientific findings on the current and future impacts of global climate change.
- Conservationists characterized the report as a dire wake-up call for world leaders. “With today’s release of the Special Report… international leaders are confronted by the stark and immediate consequences of failing to adequately address greenhouse gas emissions, as they impact the oceans,” Jason Patlis, executive director of the Marine Conservation Program at WCS (Wildlife Conservation Society), said in a statement.
‘The Blob’ is back: Pacific heat wave already second-largest in recent history
- The original Blob was a vast expanse of unusually warm water in the northeast Pacific that persisted from 2014 to mid-2016. (The unusual moniker came about because the marine heatwave appeared as a giant red blob on ocean surface temperature maps.) It eventually stretched all the way from the Gulf of Alaska to the California coast and had a number of adverse effects, contributing to a global coral bleaching event and impacting coastal salmon fisheries.
- The new Blob resembles the first in extent and location, according to the US National Oceanic and Atmospheric Administration (NOAA), which reported on September 5 that the current marine heat wave in the northern Pacific is already the second-largest recorded in the past 40 years, behind only the 2014-2016 Blob.
- Sea surface temperatures in the northeast Pacific have been more than 3 degrees Celsius above average during the current heat wave. In the 2014-2016 Blob, water temperatures reached up to 5.5 degrees Celsius above average in some places.
The Arctic and climate change (1979 – 2019): What the ice record tells us
- This story has been updated: 2019’s Arctic ice melt season started out with record heat and rapid ice loss. Though cooler weather prevailed in August, stalling the fall, by mid-September ice extent was dropping dramatically once again. Then this week, 2019 raced from fourth to second place — now behind only 2012, the record minimum.
- With 2019 providing no reversal over past years, scientists continue to document and view the Arctic Death Spiral with increasing alarm. This story reviews the 40-year satellite record, along with some of the recent findings as to how Arctic ice declines are impacting the global climate.
- Researchers are increasingly certain that melting ice and a warming Arctic are prime factors altering the northern jet stream, a river of air that circles the Arctic. A more erratic jet stream — with increased waviness and prone to stalling — is now thought to be driving the increasingly dire, extreme global weather seen in recent years.
- The 40-year satellite record of rapidly vanishing Arctic ice — as seen in a new NASA video embedded within this article — is one of the most visible indicators of the intensifying climate crisis, and a loud warning to world leaders meeting at the UN in New York next week, of the urgent need to drastically cut carbon emissions.
2019 in line for second lowest Arctic sea ice extent record
- 2019 has seen constant heat and melt conditioning of the Arctic sea ice, resulting in record, and near record, daily and monthly extent and volume stats over much of the melt season. The average volume for July, for example, fell to 8,800 cubic kilometers (2,111 cubic miles), a new record low.
- Whether 2019 will set a new all-time extent or volume record at the September sea ice minimum remains to be seen, with ice extent shrinking less quickly since mid-August, possibly putting this year in second place, though certainly among the top five record lowest minimums.
- The big news this year was the relentless heat in the Arctic, with record heat waves over Alaska, Scandinavia and Greenland, resulting in massive glacial runoff into the sea. Wildfires were rampant, with reindeer and fish including salmon possibly adversely impacted by very hot air and water temperatures.
- Whether or not 2019 sets a new sea ice extent or volume low record this September is incidental. What this year dramatically showed is that the climate crisis has anchored itself firmly in the Arctic, and shows no signs of easing over the long-haul.
A Philippine community that once ate giant clams now works to protect them
- The island of Samal in the southern Philippines is home to one of 40 sites around the country where giant clams (Tridacna spp.) are nurtured as part of a conservation program.
- For the local community, giant clams had long been a source of food, so there was initially some resistance to the program when it started in 2001.
- Today, the clam sanctuary has grown into an ecotourism venture that generates revenue for the community and employs local seniors, particularly women.
- However, the mollusks are threatened by rising ocean temperatures, declining salinity and other human-driven factors, leaving their fate — and that of the community that has come to depend on them — in the balance.
June 2019 was the hottest on record: NOAA
- June 2019 was the hottest June recorded in the 140 years since the US National Oceanic and Atmospheric Administration (NOAA) began collecting global temperature data, the agency announced yesterday.
- On land, June’s global average surface temperature was 2.41 degrees Fahrenheit above the 20th-century average of 55.9°F, the highest June land temperature on record, beating the previous record set in 2015. At sea, average surface temperatures were 1.46 degrees Fahrenheit above the 20th-century monthly average of 61.5 degrees Fahrenheit, tying June 2016 as the highest global average ocean temperature on record for June.
- 2019 also saw the second-smallest Arctic sea ice extent for the month of June in the 41-year record, according to an analysis of NOAA and NASA data by the National Snow and Ice Data Center. For the fourth consecutive June, Antarctic sea ice extent was also lower than average, reaching a mark 425,000 square miles, or 8.5 percent, below the 1981-2010 average.
Study examines how the Atlantic surfclam is successfully adapting to climate change
- Global climate change poses a severe threat to marine life, but scientists have found at least one species that appears to be successfully adapting to warmer ocean waters.
- A recent study published in the Proceedings of the National Academy of Sciences found that, even without factoring in the impacts of fishing, global animal biomass in Earth’s oceans is expected to decrease by as much as 17 percent by 2100 under a “high emissions” scenario that leads to 3-4 degrees Celsius of warming.
- However, a new study published in the journal Marine Ecology Progress Series, shows that, as ocean temperatures rise, Atlantic surfclams, a large saltwater clam found mostly in the western Atlantic Ocean, are capably shifting their range into waters that would have previously been inhospitable to their survival.
Arctic in free fall: 2019 sea ice volume sinks to near record for June
- High temperatures and relentless sun caused Arctic sea ice volume and extent to plummet this June.
- The June 2019 monthly average for Arctic sea ice volume was 15,900 cubic kilometers (3,814 cubic miles), just short of the monthly average record set in 2017. But by the end of the month this year, a new daily record occurred as volume loss advanced rapidly, leaving just 12,047 cubic kilometers (2,890 cubic square miles) of sea ice on June 30 — that’s 106 cubic kilometers (25 cubic miles) lower than the previous record for this time of year.
- On July 10, Arctic sea ice extent for 2019 fell to 8.338 million square kilometers (3.219 million square miles), surpassing 2012’s record low of 8.359 million square kilometers (3.227 million square miles) for this time of year.
- While changing weather always dictates sea ice minimum extent and volume in September, scientists say that if conditions remain favorable for melt and ice export to the North Atlantic, then 2019 could beat all records. And because what happens in the Arctic doesn’t stay there, that could mean trouble for the world’s weather.
Arctic sea ice extent just hit a record low for early June; worse may come
- The lowest Arctic sea ice extent in the 40-year satellite record for this time of year was set on June 10 with just 10.901 million square kilometers of ice remaining, dipping just below the previous record set in 2016 of 10.919 million square kilometers. This year’s record is likely to deepen at least for the coming days.
- Some scientists theorize that declining Arctic summer sea ice extent, which has fallen by roughly half since 1979, could be generating a cascade of harmful effects: as the Arctic melts, the heat differential between the Far North and temperate zone lessens, causing the jet stream (high altitude Northern Hemisphere winds), to falter.
- As the polar jet stream loses energy, it can fail to hug the Arctic Circle. Instead it starts to dip deeply into the temperate zone forming great waves which can block and stall weather patterns there, bringing long punishing bouts of rain and floods like those seen in the Midwest this spring, or extended heatwaves and drought.
- Arctic weather variations are too complex to predict in advance, but 2019 has made a strong start toward possibly beating 2012 for the lowest annual ice extent record. Records aside, the Arctic sea ice death spiral and the extreme weather it can trigger are adversely impacting agriculture, infrastructure, economics and human lives.
’Unprecedented’ loss of biodiversity threatens humanity, report finds
- The U.N.’s Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services released a summary of far-reaching research on the threats to biodiversity on May 6.
- The findings are dire, indicating that around 1 million species of plants and animals face extinction.
- The full 1,500-page report, to be released later this year, raises concerns about the impacts of collapsing biodiversity on human well-being.
Guns, Corals and Steel: Are Nuclear Shipwrecks a Biodiversity Hotspot?
- My team and I used deep technical diving techniques to explore the coral biodiversity of warships sunk in the 1946 nuclear bomb tests at Bikini Atoll.
- Our surveys revealed that eight nuked warships harbored 27 percent of the world’s coral genera on their hulls, superstructures and armaments.
- At depths down to 55 meters (180 feet), these ships lie well below the 21st-century ocean warming danger zone.
- As a result, Bikini’s massive warships have become unexpected arks of coral biodiversity.
Ocean winds, wave heights have increased around the world
- An analysis of 33 years’ worth of data finds that ocean winds and wave heights are becoming more extreme worldwide, with the Southern Ocean seeing the largest increases.
- In order to examine long-term trends, Ian Young and Agustinus Ribal of Australia’s University of Melbourne combined nearly 4 billion measurements of wind speeds and wave heights collected from 31 satellite missions between 1985 and 2018 and data from 80 ocean buoys deployed around the globe into a single, extensive dataset.
- The researchers found that there have been small increases in mean wind speed and wave height over the past 33 years, but they found stronger increases in extreme conditions, which they define in the paper as wind speed and wave height measurements that fall in the 90th percentile or above
Arctic in trouble: Sea ice melt falls to record lows for early April
- As of April 9, the Arctic had around 13.6 million square kilometers (5.3 million square miles) of ice cover, putting it firmly below any other year on record for the same time of year, and nearly two weeks ahead of previous early April records set in 2017 and 2018.
- The implications of such low sea ice extent for this time of year is concerning to scientists. However, predicting seasonal ice melt is very difficult, and changes in Arctic weather could cause the early melt to stall, or even reverse to some degree.
- Two new Arctic studies are also troubling. Researchers have found that between 1998 and 2017, seventeen percent less ice exited shallow continental shelf seas — nurseries for sea ice — to reach the Central Arctic Ocean and Fram Strait. This loss in ice being transported could have serious implications for Arctic sea ice melt and impact biodiversity as well.
- A second study found that rising Arctic air temperatures are driving change across the entire ecosystem. Hotter temperatures are impacting forest and tundra growing seasons, increasing wildfires, boosting rain and snowfall, and melting ice — shifting the region from its 20th century condition into an unprecedented state.
30 percent by 2030? Study maps out how to protect the world’s oceans
- Scientists have mapped out an enormous network of potential marine protected areas that cover more than one-third of the world’s oceans and represent all marine ecosystem categories.
- The proposed network is part of a wider movement to get countries to commit to protecting 30 percent of the oceans by 2030. Governments are already working toward an international pledge to protect at least 10 percent by 2020.
- The scientists released their report outlining the network on April 4, a day before the conclusion of the second round of negotiations at the United Nations toward a landmark treaty to address the ongoing decline of marine biodiversity on the high seas.
Ocean acidification could impact Atlantic cod populations more severely than previously thought
- A 2016 study determined that, at the ocean acidification levels expected by the end of the century if we do nothing to draw down CO2 emissions, twice as many cod larvae will die within their first 25 days, causing the number of cod who reach maturity and reproduce to drop by 8 and 24 percent for the Western Baltic and Barents Sea populations, respectively.
- Scientists hoped that those cod who managed to reach maturity might be helping the species adapt to the conditions brought on by global climate change. But new research appears to have dashed those hopes.
- The new study, which was published in the journal Global Change Biology last month, found that surviving cod larvae suffer significant organ damage and developmental delays that could cause problems throughout their lifetimes.
‘Managed resilience’ not a successful strategy for conserving coral reefs, researchers find
- Coral reefs in protected areas that regulate fishing and pollution have declined to the same extent as reef systems in unprotected areas, according to recent research.
- The study, published in the Annual Review of Marine Science in January, determined that ocean warming is the primary cause of the global decline of reef-building corals.
- The researchers behind the study say their findings are consistent with a growing body of evidence that shows so-called “managed resilience” efforts, such as controls on fishing and pollution, don’t help coral reefs cope with the impacts of climate change.
As Arctic neared 2019 winter max, Bering Sea was virtually ice-free
- Though yet to be called officially by scientists, Arctic sea ice extent appeared to hit its annual maximum on March 13 when it covered 14.777 million square kilometers. The 2019 max stats are among the top ten lowest on record, and well below the 1981-2010 average maximum extent of 15.64 million square kilometers.
- One thing that stood out this winter was the extraordinarily low amounts of ice in the Bering Sea at the start of March, surpassing record lows seen in 2018 for the same dates. Seasonal ice in the Bering Sea is already known to be volatile, but it’s getting worse under climate change.
- A new study also found something remarkable on the opposite side of the Arctic: in recent years, according to the research, Greenland has been receiving more rain, including in winter.
- These rain events are triggering sudden, rapid ice melt and are responsible for a tremendous amount of annual runoff. Ultimately, these rains could prove catastrophic for the Greenland ice sheet, and for sea level rise.
New MPA established in Philippines includes community-led monitoring program
- A new marine protected area (MPA) has been founded in the Philippines within what are considered some of the most biologically diverse waters on Earth.
- The new MPA, which has been given the name Pirasan, encompasses more than 54 acres (about 22 hectares) of thriving coral reef habitat. The MPA was designed to protect this pristine reef system and, at the same time, boost an emerging local ecotourism industry.
- In addition to establishing the new protected area, the municipality of Tingloy has committed to a uniquely ambitious two-year program to monitor the reef’s health and empower local residents as stewards of the reef.
Our brains can lead us astray when making ‘eco-friendly’ decisions
- Humans rely on a set of cognitive tools, developed to help us sustain interpersonal relationships, to govern our choices that affect the global climate, a pair of psychologists suggests.
- People who purchase food with “eco-friendly” labeling might be apt to buy more of it thinking of it as an offset, when, in reality, all consumption has a climate cost.
- The team suggests that more accurate labeling could help consumers understand which choices are “less bad” rather than “good” for the environment.
Blue whales remember best times and places to find prey
- A new study demonstrates that blue whales in the northern Pacific Ocean use their memories, instead of cues in the environment, to guide them to the best feeding spots.
- The researchers used 10 years of data to discern the movements of 60 blue whales.
- They compared the whales’ locations with spots with high concentrations of prey over the same period.
- The whales’ reliance on memory could make them vulnerable to changes in the ocean brought about by climate change.
2018 was the fourth hottest year on record
- According to independent analyses of the latest global temperature data by the U.S. National Oceanic and Atmospheric Administration (NOAA) and National Aeronautics and Space Administration (NASA), 2018 was the fourth hottest year on record for planet Earth.
- The average global temperature in 2018 was 1.42 degrees Fahrenheit or 0.79 degrees Celsius above the 20th-century average, NOAA scientists determined. The average sea surface temperature was 1.19 degrees Fahrenheit (0.66 degrees Celsius) above average, while the land surface temperature was 2.02 degrees Fahrenheit (1.12 degrees Celsius) above average — both the fourth highest marks on record.
- The strongest warming trends have been observed in the Arctic region and its continued loss of sea ice. At the same time, declines in the ice sheets of Greenland and the Antarctic are contributing to sea level rise, while increasing temperatures are leading to longer fire seasons and more severe extreme weather events.
Deadly disease and warming ocean are wiping out a key starfish species
- The mysterious sea star wasting disease has caused massive declines of the sunflower sea star (Pycnopodia helianthoides), a major predator within kelp forests in the Northeast Pacific.
- The widespread decline of the starfish, especially in deeper waters, has been particularly shocking, researchers say, because it means that the animals have not been able to take refuge in deep waters as people had expected.
- The study found that the occurrence of the largest declines in the sunflower sea star numbers coincided with abnormally high sea surface temperatures, suggesting that warming oceans due to climate change could have exacerbated the disease’s impact.
- The collapse of the sunflower sea star could have cascading effects on the ecosystem: the sea star is a major predator of sea urchins, and without the sea stars to keep a check on the urchin population, the latter would feast on the kelp forests, leaving behind a barren seascape.
Warmer waters shrink krill habitat around Antarctica
- A new study has found that fewer young krill are surviving to adulthood around Antarctica as ocean temperatures have risen in the Southern Ocean in the past few decades.
- The researchers, who looked at decades of data on krill body lengths and abundance, found that the highest densities of krill had shifted southward by some 440 kilometers (273 miles) since the 1920s.
- The scientists note that the findings could alter food webs in the Southern Ocean.
- Currently, the internationally managed krill fishery does not take the location and size of the krill population into account.
Climate change is making waves stronger and putting coastlines at risk
- According to research published in the journal Nature Communications this month, the energy of ocean waves has grown over the past seven decades, which could have significant implications for coastal communities and ecosystems.
- The energy in ocean waves is transmitted from the wind. As the upper ocean has warmed, wind patterns have been affected globally, resulting in stronger ocean waves. The researchers behind the Nature Communications study say they found a long-term trend of wave power increasing globally in direct association with historical warming of the ocean surface.
- The researchers say their results show that global wave power could be used as an indicator of global warming similar to how atmospheric carbon dioxide concentration levels, global sea level rise, or global surface atmospheric temperatures are used now.
Ocean warming projected to accelerate more than four-fold over next 60 years: Study
- 2017 currently holds the record for hottest ocean temperatures, but, according to a new study, 2018 is likely to take the top spot as hottest year on record for Earth’s oceans as global warming’s impacts accelerate.
- The mean speed of ocean warming over the past 60 years, from roughly 1958 to 2017, was 5.46 zettajoules per year, according to the study. The oceans will warm at an even more rapid pace over the next 60 years, with the mean speed of ocean warming projected to be 23.78 zettajoules per year.
- If we proceed with “business as usual,” the upper ocean (above a depth of 2,000 meters) will warm by 2,020 ZetaJoules by 2081-2100, six times more than the total ocean warming recorded over the past 60 years, the researchers found. If we were to meet the emissions reductions targets that countries committed to under the Paris Climate Agreement, however, we could cut total ocean warming within that timeframe nearly in half to about 1,037 zettajoules.
Worst mass extinction event in Earth’s history was caused by global warming analogous to current climate crisis
- The Permian period ended about 250 million years ago with the largest recorded mass extinction in Earth’s history, when a series of massive volcanic eruptions is believed to have triggered global climate change that ultimately wiped out 96 percent of marine species in an event known as the “Great Dying.”
- According to Justin Penn, a doctoral student at the University of Washington (UW), the Permian extinction can help us understand the impacts of climate change in our own current era.
- Penn led a team of researchers that combined models of ocean conditions and animal metabolism with paleoceanographic records to show that the Permian mass extinction was caused by rising ocean temperatures, which in turn forced the metabolism of marine animals to speed up. Increased metabolism meant increased need for oxygen, but the warmer waters could not hold enough oxygen to meet those needs, and ocean life was left gasping for breath.
Cyclone harmed Fijian crab fishery in 2016, research finds
- Research published in the journal Climate and Development demonstrates that Tropical Cyclone Winston damaged mud-crab fisheries in Fiji in 2016.
- Surveys of the mostly women crab fishers in Bua province before and after Winston, one of the strongest storms ever recorded in the Southern Hemisphere, revealed that mud crabs were smaller and less numerous following the cyclone.
- The research could help government agencies address the lingering impacts of natural disasters to community fisheries.
Research links specific 2017 extreme weather events to climate change
- According to the seventh annual special report by the Bulletin of the American Meteorological Society (BAMS) probing the causal links between rising global temperatures and extreme weather events, issued last month, climate change made the Northern Great Plains drought of 2017 some 1.5 times more likely and greatly enhanced its intensity by driving long-term reductions in soil moisture.
- For the second year in a row, scientists were able to identify specific extreme weather events that cannot be explained without factoring in Earth’s warming global climate.
- A team of 120 scientists from 10 different countries used historical observations and model simulations to produce the 17 peer-reviewed analyses collected in the BAMS special report examining extraordinary weather events from around the globe that were made more likely or exacerbated by anthropogenic (human-caused) climate change.
Drone 3D models help assess risk of turtle nesting beaches to sea level rise
- In a recent study, researchers took drone-based images to map the structure of sea turtle nesting beaches in northern Cyprus to determine their susceptibility to flooding from sea level rise.
- Automated drone flights with on-board cameras can record sequences of photos of the surface below, which can be merged in a process called photogrammetry to construct three-dimensional models of the survey area.
- The fast pace of innovation and versatility of drones can improve sea turtle conservation efforts through cheaper, more efficient monitoring.
2018’s top 10 ocean news stories (commentary)
- Marine scientists from the University of California, Santa Barbara, share their list of the top 10 ocean news stories from 2018.
- Hopeful developments included international efforts to curb plastic pollution and negotiate an international treaty to protect the high seas.
- Meanwhile, research documenting unprecedented ocean warming, acidification, and oxygen decline spotlighted the real-time unfolding of climate change.
- This post is a commentary. The views expressed are those of the authors, not necessarily Mongabay.
Photos highlight evolving roles of AI, citizen science in species research
- A recent observation by an amateur naturalist of a fiddler crab species hundreds of kilometers north of its known range challenged the complementary strengths of computer vision and human expertise in mapping species distributions.
- The naturalist uploaded this record to the iNaturalist species database used by amateurs and experts to document sightings; expert input correctly identified the specimen after the platform’s computer vision algorithms did not acknowledge the species outside its documented range.
- Citizen naturalist observations can be used to document rapid changes in species distributions. They also can improve modeling and mapping work conducted by researchers and play an increasing prominent role in building environmental databases.
Trump Admin moves closer to authorizing oil and gas exploration off the Atlantic coast
- The Trump Administration announced today that it will issue five Incidental Harassment Authorizations (IHAs) for airgun blasting off the Atlantic coast. Seismic airgun blasting is used to search for oil and gas deposits deep beneath the floor of the ocean.
- Seismic surveying involves ships towing airgun arrays that continually blast intense bursts of compressed air into the water every 10 to 12 seconds as a means of determining what resources might lie beneath the ocean floor. These seismic airguns are so loud that the noise can travel as many as 2,500 miles underwater.
- Environmentalists were quick to decry the Administration’s decision to issue the IHAs on the grounds that marine mammals will face severe threats as a result of seismic testing in the Atlantic Ocean.
New picture of coral reef health opens avenues for saving them
- New research has identified five potential phases, or “regimes,” of coral reef health, helping scientists and ecosystem managers better assess the condition of reefs.
- The study also revealed that certain transitions from one phase to another were more likely to result from human-induced changes to the ocean.
- The authors of the study say the research could help identify new opportunities to save and improve the health of reefs.
Coral bleaching events cause behavioral changes in key reef fish species
- New research suggests that higher ocean temperatures and coral bleaching are also triggering rapid behavioral shifts in reef fish.
- Over the course of two years, an international team of researchers spent more than 600 hours underwater observing butterflyfish, a species that is considered a key indicator of coral reef health, both before and after a global coral bleaching event in 2016.
- The researchers found that aggressive behavior had decreased in butterflyfish by an average of two thirds, with the biggest behavorial changes observed on reefs where bleaching had killed off the most coral.
$10bn pledged in new commitments to protect the world’s oceans
- Representatives of governments, the private sector, civil society groups and philanthropic organizations have pledged billions of dollars to protect vast swaths of the world’s oceans.
- The impacts of illegal, unreported and unregulated (IUU) fishing and climate change on the world’s oceans were a focus of recently concluded Our Ocean Conference in Bali, Indonesia.
- Cooperation between governments is needed to prevent the world’s oceans from experiencing devastating damage from an onslaught of factors led by climate change.
Deep reefs were not spared by 2016 mass bleaching event on Great Barrier Reef
- New research finds that the mass bleaching event that led to the death of 30 percent of shallow-water corals on the Great Barrier Reef in 2016 also had a substantial impact on deep reefs.
- Occurring at depths lower than 30 to 40 meters below the surface of the sea, deep coral reefs, also known as mesophotic reefs, were previously thought to be “ecological refuges from mass bleaching” thanks to cold water rising up from deeper in the ocean, according to a study published in the journal Nature Communications this month.
- But researchers determined that deep reefs’ ability to offer “ecological refuge” to coral has some important limitations, and that both shallow and deep reefs are at risk of mass bleaching in the future.
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