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Climate
'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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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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Greenpeace Denmark Complaint Accuses Dairy Giant of 'Systemic Greenwashing'
"Greenwashing and false marketing will not be tolerated, no matter how big you are and where you are based," said one Greenpeace Denmark campaigner.
Jun 05, 2025
Greenpeace Denmark this week filed a formal complaint against the Denmark-based dairy producer Arla Foods, accusing the firm of creating a "false and misleading picture" of actual emission reductions the company has achieved.
The green group is arguing the company has both misled consumers when it comes to Arla's progress toward achieving climate goals and that its reporting does not meet requirements under the Danish Annual Accounts Act.
Arla is the world's fifth-largest dairy company, according to its website.
Greenpeace Denmark submitted the complaint to the Danish Business Authority, the body in Denmark that controls and supervises compliance with business regulations, on Monday.
Greenpeace Denmark says it is concerned that data from Arla's annual reports appears to show that Arla has "changed its calculation methods and data foundation for Scope 3 emissions per kilogram of milk and whey since the original 2015 baseline year," but the dairy producer has not consistently or transparently adjusted that baseline across all of its reporting.
"The 2015 baseline is built on older, less precise national statistics from 2012, and the subsequent shift to more specific farm-level data and new emission factors—without a clear and consistent baseline adjustment—creates major uncertainty about Arla's real emission reductions since 2015," per the complaint.
The Danish Annual Accounts Act includes requirements to disclose corporate social responsibility information that is true and not misleading. Compliance with this provision, according to the complaint, "is essential because the provision is intended to ensure transparency about a company's environmental and broader sustainability impacts. The rules aim to give investors, partners, and society at large access to essential, credible, and comparable information about corporate sustainability practices, risks, and objectives."
"Arla presents itself as a Big Dairy role model on climate and nature, with a concern for animal welfare. But behind the scenes, it is lobbying to repeal laws that ensure the well-being of farm animals. This must stop, and the public needs to know," said Gustav Martner, creative lead and advertising expert at Greenpeace Nordic, in a statement published Wednesday.
This latest complaint comes on the heels of two complaints filed by Greenpeace Sweden against Arla, also alleging "systemic greenwashing," and a lawsuit filed by Greenpeace Aotearoa (New Zealand) last year against the dairy firm Fonterra.
"By coordinating complaints against Arla in both countries it calls home, we aim to set a precedent: Greenwashing and false marketing will not be tolerated, no matter how big you are and where you are based," said Christian Fromberg, campaign lead of agriculture and nature at Greenpeace Denmark, in a statement on Wednesday.
Common Dreams wrote to Arla for comment about the complaints. The company did not respond before press time.
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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), toldU.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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