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biodiversity
'Ticking Time Bomb': Study Says Ocean Acidification Crossed Planetary Boundary
"We're gambling with both biodiversity and billions in economic value every day that action is delayed," said one expert.
Jun 09, 2025
As this year's United Nations Ocean Conference began in France on Monday, scientists published a study showing that another "planetary boundary," or barriers that ensure the Earth is a "safe operating space for humanity," has been crossed.
Researchers said in 2023 that 6 of the 9 boundaries—biogeochemical flows, biosphere integrity, the climate, freshwater, land use, and novel entities—had been crossed. Last year, they issued a "red alert" about ocean acidification, the topic of the new study, Ocean Acidification: Another Planetary Boundary Crossed.
As the U.S. National Oceanic and Atmospheric Administration (NOAA) explains, humanity's burning of fossil fuels and land use changes have caused the concentration of carbon dioxide in the atmosphere to soar, and the ocean absorbs some of it. The resulting chemical interactions make seawater more acidic.
In the new study, scientists from NOAA, Oregon State University, and the United Kingdom's Plymouth Marine Laboratory (PML) wrote that "we improve upon the ocean acidification planetary boundary assessment and demonstrate that by 2020, the average global ocean conditions had already crossed into the uncertainty range of the ocean acidification boundary."
"This analysis was further extended to the subsurface ocean, revealing that up to 60% of the global subsurface ocean (down to 200 m) had crossed that boundary, compared to over 40% of the global surface ocean," they continued. "These changes result in significant declines in suitable habitats for important calcifying species, including 43% reduction in habitat for tropical and subtropical coral reefs, up to 61% for polar pteropods, and 13% for coastal bivalves."
"As our seas increase in acidity, we're witnessing the loss of critical habitats that countless marine species depend on, and this, in turn, has major societal and economic implications."
The study's lead author, North-East Atlantic Ocean Acidification Hub chair and PML professor Helen Findlay, said in a Monday statement that "looking across different areas of the world, the polar regions show the biggest changes in ocean acidification at the surface. Meanwhile, in deeper waters, the largest changes are happening in areas just outside the poles and in the upwelling regions along the west coast of North America and near the equator."
"Most ocean life doesn't just live at the surface—the waters below are home to many more different types of plants and animals. Since these deeper waters are changing so much, the impacts of ocean acidification could be far worse than we thought," Findlay noted. "This has huge implications for important underwater ecosystems like tropical and even deep-sea coral reefs that provide essential habitats and nursing refuge for many species, in addition to the impacts being felt on bottom-dwelling creatures like crabs, sea stars, and other shellfish such as mussels and oysters."
Fellow PML professor and Global Ocean Acidification Observing Network co-chair Steve Widdicombe, who provided the study authors with comments on a draft, said Monday that "ocean acidification isn't just an environmental crisis—it's a ticking time bomb for marine ecosystems and coastal economies."
"As our seas increase in acidity, we're witnessing the loss of critical habitats that countless marine species depend on, and this, in turn, has major societal and economic implications," he warned. "From the coral reefs that support tourism to the shellfish industries that sustain coastal communities, we're gambling with both biodiversity and billions in economic value every day that action is delayed."
The 2024 Planetary Boundaries report showed 6/9 boundaries breached with the 7th, Ocean Acidification, in danger. A new study shows that this too has now been crossed. The implications are huge!onlinelibrary.wiley.com/doi/10.1111/...#climatechange #oceanacidification #planetaryboundaries #oceans
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— Dr Tom Harris (@drtomharris.bsky.social) June 9, 2025 at 9:22 AM
Costa Rica and France are co-hosting the U.N. summit in the French coastal city of Nice this week. The theme is "accelerating action and mobilizing all actors to conserve and sustainably use the ocean."
Greenpeace USA oceans campaign director John Hocevar, who will be attending the meeting, said Monday that "this conference couldn't come at a more critical time. The ocean is reeling from the combined impacts of industrial fishing, plastic pollution, and climate change. And just when bold leadership is most needed, the U.S. has walked away from the global stage, opening the floodgates to destruction through a barrage of Trump administration executive orders that threaten both domestic and international waters."
"We can't afford any more delay," he stressed. "The decisions made in Nice will set the tone for key global efforts to stem the ocean crisis in the coming months, including the plastics treaty, the global ocean treaty, and deep-sea mining talks at the International Seabed Authority. Whether this conference marks a turning point or takes our oceans further down the road to ruin will depend on the strength and ambition of the commitments made by the international community to stand up for science, uphold international law, and advance environmental justice."
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The Time Has Come to Establish the International Arctic Ocean Sanctuary
In addition to accelerating efforts to reduce global carbon emissions to reverse global warming, governments must urgently adopt strong, permanent protections for the entire Arctic Ocean.
Jun 08, 2025
On World Ocean Day, and the eve of the United Nations Ocean Conference in Nice, France opening Monday, the Arctic Ocean ecological crisis needs to be top of the list for attention by governments.
Given the well-documented, catastrophic decline of the Arctic Ocean sea ice ecosystem in recent decades due to climate change, coupled with the increasing threats and impacts from industry and military activity in the region, it is imperative that governments establish an International Arctic Ocean Sanctuary to preserve this extraordinary ecoregion as a global commons for peaceful, non-commercial, scientific purposes.
Covering approximately 5.4 million square miles, the Arctic Ocean is one of the most extraordinary and vibrant regions of the global ocean, and plays an important role regulating Earth’s climate.
Combined with the effects of climate change, industrialization and militarization would further accelerate the ecological and social collapse of the struggling Arctic Ocean region.
The Arctic marine ecosystem is globally unique, productive, and remains relatively unexplored. The ocean biome supports more than 7,000 identified species, many of which are found nowhere else on Earth—polar bears, walrus, several kinds of ice seals, narwhals, beluga whales, bowhead whales, some of the largest populations of seabirds in the world, and many unique fish and invertebrate populations. It hosts cold seeps, hydrothermal vents, stunning benthic habitats, a rich pelagic ecosystem that remains surprisingly active during winter darkness, and supports the subsistence cultures of coastal Indigenous Peoples.
However, this unique polar marine ecosystem is now one of the most endangered regions of Earth’s biosphere, suffering effects of climate change more severely than anywhere else. Arctic sea ice has declined by more than half in the last 50 years, losing about 1 million square miles in both summer and winter, has thinned from an average of four meters to about one meter, and could disappear entirely in summer by 2035. Multiyear sea ice has all but vanished. This remarkable decline has been caused by global carbon emissions from human activity, mainly fossil fuel use.
The loss of Arctic sea ice over the last half-century constitutes one of the largest declines in ecological habitat on Earth, rivaling the loss of tropical rainforests. The resultant Arctic Ocean ecological crisis is now severe, and predicted to get much worse in coming decades.
In addition to devastating impacts of climate change in the Arctic Ocean, commercial interests are clamoring to exploit ice-free offshore areas for oil and gas, methane hydrates, minerals, commercial fishing, shipping, and tourism. And Arctic coastal nations have made Extended Continental Shelf (ECS) seabed claims (pursuant to U.N. Law of the Sea, Article 76) beyond their 200-mile Exclusive Economic Zones (EEZs), a dangerous territorial expansion into international waters with an eye toward resource extraction.
As Arctic nations and others (China, India, etc.) advance their own parochial interests across the region, there is a growing competitive race to exploit Arctic offshore resources and to project military power across the region to secure these competing national interests. As such, the risk of military confrontation across the Arctic Ocean is escalating. Combined with the effects of climate change, industrialization and militarization would further accelerate the ecological and social collapse of the struggling Arctic Ocean region, and would clearly compromise the ability of the bioregion and its people to survive the 21st-century climate crisis.
In fact, the resource and political tensions in the Arctic Ocean today are remarkably similar to the Antarctic after World War II, that were resolved then by the leadership of U.S. (Republican) President Dwight D. Eisenhower proposing and negotiating the historic 1959 Antarctic Treaty. The international Treaty, now with 58 nation-state members, permanently protects the extraordinary 5.5 million square-mile Antarctic continent as a global commons for peaceful, scientific purposes, free from nuclear testing, military operations, economic exploitation, and territorial claims. The Antarctic Treaty remains the single greatest conservation achievement in history.
The same opportunity now presents itself with the Arctic Ocean. In addition to accelerating efforts to reduce global carbon emissions to reverse global warming, governments must urgently adopt strong, permanent protections for the entire Arctic Ocean to give this region and its people the best chance possible to survive the 21st-century climate crisis. Given the pace of decline, this may be our last best chance to do so.
While Arctic nations have begun protecting some areas off their coasts, still less than 5% of Arctic Ocean waters are in permanently protected status. This is clearly insufficient.
The proposed circumpolar Arctic Ocean Sanctuary must fully protect not only international waters beyond coastal state 200-mile EEZs across the 1.1 million square mile Central Arctic Ocean (as is currently proposed), but also the highly productive waters within the EEZs of Arctic coastal nations—Canada, Norway, Denmark and Greenland, Russia, and the U.S., where most ecological activity, human impact, and threat occurs. The sanctuary should permanently prohibit oil and gas leasing, mineral leasing, commercial fishing, military activities, improve shipping safety, reduce pollutants, and enhance scientific research.
To be sure, it is a big ask of the five Arctic coastal nations to contribute some of their claimed territory into a globally protected area, but this was the right thing to do in 1959 in the Antarctic, and it is the right thing to do now for the Arctic.
While the current federal administrations in the Russia and U.S. habitually oppose any and all environmental conservation proposals, perhaps presidents Vladimir Putin and Donald Trump might see this as a historic legacy in the midst of the environmental havoc they have caused, a chance to be remembered as Eisenhower is today for his leadership in negotiating the Antarctic Treaty. And just to note, former President Joe Biden ignored this request entirely, enacted no comprehensive permanent protections in the U.S. Arctic Ocean off Alaska, and made no effort to begin discussions on the International Arctic Ocean Sanctuary.
Global society has a historic choice to make with the imperiled Arctic Ocean. Should we continue our competitive industrial and military expansion into one of the last wild areas of the world, further degrading a region already unraveling due to human-caused climate change? Or should we protect and sustain this magnificent place for all time, giving it and its inhabitants, human and non-human, the best chance possible to recover from climate change this century?
How we answer this question will tell us a lot about ourselves and our future.
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Analyses Expose Ocean Protection Failures Before UN Summit on 'Unprecedented Crisis'
"Conserving 30% of our ocean by 2030 is not just a target—it's a lifeline for communities, food security, biodiversity, and the global economy," said one advocate.
Jun 05, 2025
Ahead of the third United Nations summit on oceans, scheduled for next week, multiple analyses have highlighted how humanity is failing to address the multipronged emergency faced by the world's seas.
"The ocean is facing an unprecedented crisis due to climate change, plastic pollution, ecosystem loss, and the overuse of marine resources," Li Junhua, secretary-general for the 2025 United Nations Ocean Conference (UNOC3), told U.N. News.
UNOC3 is co-chaired by Costa Rica and France, and set to be held in the French coastal city of Nice June 9-13. Its theme is "accelerating action and mobilizing all actors to conserve and sustainably use the ocean."
"Only $1.2 billion of finance is flowing to ocean protection and conservation—less than 10% of what is needed."
One of the new analyses—The Ocean Protection Gap: Assessing Progress Toward the 30×30 Target—was commissioned by the Bloomberg Ocean Fund and produced in partnership with nature groups, including WWF International.
The report, released Thursday, focuses on the 30×30 goal from the Kunming-Montreal Global Biodiversity Framework, which is a commitment to conserve at least 30% of the world's land and ocean by 2030. The document warns that right now, "just 8.6% of the ocean is protected, with only 2.7% assessed and deemed effectively protected—a far cry from the 30% target."
Additionally, "only $1.2 billion of finance is flowing to ocean protection and conservation—less than 10% of what is needed," the report notes. It urges governments behind the framework to boost funding, including honoring their pledge to "provide at least $20 billion by 2025 and $30 billion by 2030 in international biodiversity finance to developing countries."
Calling the analysis "a wake-up call," Pepe Clarke, oceans practice leader at WWF, stressed that "we have the science, the tools, and a global agreement, but without bold political leadership and a rapid scaling of ambition, funding, and implementation, the promise of 30×30 will remain unfulfilled. Conserving 30% of our ocean by 2030 is not just a target—it's a lifeline for communities, food security, biodiversity, and the global economy."
🚨In a timely comment piece in @nature.com ahead of #UNOC3, leading ocean scientists make the case for protecting the High Seas from all extraction. @profcallum.bsky.social @ubcoceans.bsky.social @marklynas.bsky.social www.nature.com/articles/d41...
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— Deep Sea Conservation Coalition (@deepseaconserve.bsky.social) June 4, 2025 at 12:07 PM
Another new report, released Thursday by the U.S.-based Earth Insight in partnership with groups from around the world, details "the global expansion of offshore and coastal oil and gas development and its profound threats to marine ecosystems, biodiversity, and the livelihoods of coastal communities—drawing on regional case studies to illustrate these threats."
The analysis found significant overlap between fossil fuel blocks—sites where exploration and production are permitted—and coral, mangroves, sea grass, and allegedly protected areas. It calls for halting oil and gas expansion, retiring blocks not already assigned to investors, ending financial support for coastal and offshore fossil fuel development, investing in renewables, ensuring a just transition, restoring impacted ecosystems, and strengthening legal, financial, and policy frameworks.
Last week, Oceana released another analysis of fishing in France's six Marine Nature Parks in 2024. The conservation group found that over 100 bottom trawling vessels appeared to spend more than 17,000 hours fishing in these "protected" spaces.
"Bottom trawling is one of the most destructive and wasteful practices taking place in our ocean today," said Oceana board member and Sea Around Us Project founder Daniel Pauly in a statement. "These massive, weighted nets bulldoze the ocean floor, destroying everything in their path and remobilizing carbon stored in the seabed. You cannot destroy areas and call them protected. We don't need more bulldozed tracks on the seafloor. We need protected areas that benefit people and nature."
Nicolas Fournier, Oceana's campaign director for marine protection in Europe, urged action by French President Emmanuel Macron.
"This is a problem President Macron can no longer ignore," said Fournier. "France needs to go from words to action—and substantiate its claim of achieving 30×30 by actually protecting its marine treasures from destructive fishing."
As #UNOC3 approaches, it's clear: a #FossilFreeOcean is no longer optional, but a moral and legal imperative. The fight for our oceans is urgent! Read more: bit.ly/3HtViJl
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— Center for International Environmental Law (@ciel.org) June 5, 2025 at 11:02 AM
Greenpeace has also recently called out the "weaknesses" of French marine protections—and then faced what the group condemned as retaliation from the government: Authorities blocked its ship, Arctic Sunrise, from entering the port of Nice.
"Arctic Sunrise had been invited by the French Ministry of Foreign Affairs to participate in the 'One Ocean Science Congress' and in the ocean wonders parade taking place right before the U.N. Ocean Conference," the group explained in a Tuesday statement. "Greenpeace International had intended to deliver the messages of 3 million people calling for a moratorium on deep-sea mining to the politicians attending the conference."
Greenpeace International executive director Mads Christensen denounced the "attempt to silence fair criticism" before UNOC3 as "clearly a political decision" and "utterly unacceptable."
"France wants this to be a moment where they present themselves as saviors of the oceans while they want to silence any criticism of their own failures in national waters. We will not be silenced," Christensen declared. "Greenpeace and the French government share the same objective to get a moratorium on deep-sea mining, which makes the ban of the Arctic Sunrise from Nice even more absurd."
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