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climate emergency
'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 milesin 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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Despite Trump-Musk Feud, CO2 Milestone Is the 'Important News of the Day'
Scientists said that atmospheric carbon dioxide concentrations peaked above 430 parts per million for the first time in perhaps 30 million years.
Jun 06, 2025
The concentration of carbon dioxide in the atmosphere peaked above 430 parts per million in 2025—the highest it has been in millions of years—according to data released by the National Oceanic and Atmospheric Administration and Scripps Institution of Oceanography at the University of California, San Diego on Thursday.
The news was overshadowed by the explosive feud between U.S. President Donald Trump and his erstwhile backer Elon Musk, but climate activist Bill McKibben argued that it was ultimately more consequential.
"In the long run, this is actually going to be the important news of the day—CO2 in the atmosphere passes another grim milestone," McKibben wrote on social media.
In the long run, this is actually going to be the important news of the day--co2 in the atmosphere passes another grim milestone
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— Bill McKibben (@billmckibben.bsky.social) June 5, 2025 at 4:33 PM
Carbon dioxide has been accumulating in the atmosphere due primarily to the human burning of fossil fuels, as well as by the clearing of forests and other natural carbon sinks. There, it acts as a greenhouse gas, trapping heat from the Earth, and is the primary gas responsible for the rise of global temperatures by approximately 1.1°C from the 1850 -1900 average. This warming has already had a host of dramatic impacts, from extreme weather events to sea-level rise to polar ice melt, and scientists warn these impacts will only accelerate under current energy policies, which put the world on track for around 3°C of warming by 2100.
The last time that atmospheric CO2 concentrations topped 430 ppm was most likely more than 30 million years ago, Ralph Keeling, who directs the Scripps CO2 Program, toldNBC News.
"It's changing so fast," he said. "If humans had evolved in such a high-CO2 world, there would probably be places where we wouldn't be living now. We probably could have adapted to such a world, but we built our society and a civilization around yesterday's climate."
"While largely symbolic, passing 430 ppm should be a wake-up call."
Scripps and National Oceanic and Atmospheric Administration both measure carbon dioxide levels from NOAA's Mauna Loa Observatory in Hawaii, where Charles Keeling began taking measurements in 1958. As CO2 levels rise over time, they also follow a seasonal cycle—peaking in May before falling in the Northern Hemisphere summer and rising again in the fall.
This May, Scripps Oceanography calculated an average of 430.2 ppm for 2025, which is 3.5 ppm over the average for May 2024. NOAA's Global Monitoring Laboratory, meanwhile, calculated a monthly average of 430.5 ppm, a 3.6 ppm jump from the year before and the second-steepest yearly climb since 1958.
"Another year, another record," Keeling said in a statement. "It's sad."
The news comes two months after Mauna Loa daily measurements surpassed 430 ppm for the first time in March, which Plymouth Marine Laboratory professor Helen Findlay called "extremely disappointing and worrying."
"While largely symbolic, passing 430 ppm should be a wake-up call, especially given the accelerated response we are seeing of glaciers and ice sheets to current warming," Dr. James Kirkham, chief scientist of the Ambition on Melting Ice coalition of governments, said at the time.
"This upward trajectory is a direct result of continued fossil fuel use, likely exacerbated by emissions from extreme wildfires last year, methane leaks from fossil fuel extraction and possibly greater permafrost emissions, alongside decreased ability of very warm oceans to absorb CO2," Kirkham said.
The monthly record also comes a little more than a week after a United Nations report warned that there was a small chance global temperatures could surpass 2°C in at least 1 of the next 5 years, only a decade after world leaders pledged in the Paris agreement to keep global temperatures "well-below" that level.
"Carbon emissions are still rising, and the atmosphere is going to keep heating further until greenhouse gas concentrations stabilize," Matt Kean, who chairs Australia's Climate Change Authority, wrote in response to the Scripps and NOAA figures. "What sort of climate do we want to leave our children and those who come after them?"
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