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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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Rising Seas From Fossil Fuels Threaten Inland Migration 'Never Witnessed in Modern Civilization'
With governments "scaling back their already meager" actions to tackle climate breakdown, said one ecologist, "our present-day human culture is on a suicide course."
May 20, 2025
Less than six months away from the next United Nations summit for parties to the Paris climate agreement, scientists on Tuesday released a study showing that even meeting the deal's 1.5°C temperature target could lead to significant sea-level rise that drives seriously disruptive migration inland.
Governments that signed on to the 2015 treaty aim to take action to limit global temperature rise by 2100 to 1.5°C beyond preindustrial levels. Last year was not only the hottest in human history but also the first in which the average global temperature exceeded 1.5°C. Multiple studies have warned of major impacts from even temporarily overshooting the target, bolstering demands for policymakers to dramatically rein in planet-heating fossil fuels.
The study published Tuesday in the journal Nature Communications Earth and Environmentwarns that 1.5°C "is too high" and even the current 1.2°C, "if sustained, is likely to generate several meters of sea-level rise over the coming centuries, causing extensive loss and damage to coastal populations and challenging the implementation of adaptation measures."
"To avoid this requires a global mean temperature that is cooler than present and which we hypothesize to be closer to +1°C above preindustrial, possibly even lower, but further work is urgently required to more precisely determine a 'safe limit' for ice sheets," the paper states, referring to Antarctica and Greenland's continental glaciers.
Co-author Jonathan Bamber told journalists that "what we mean by safe limit is one which allows some level of adaptation, rather than catastrophic inland migration and forced migration, and the safe limit is roughly 1 centimeter a year of sea-level rise."
"If you get to that, then it becomes extremely challenging for any kind of adaptation, and you're going to see massive land migration on scales that we've never witnessed in modern civilization," said the University of Bristol professor.
In terms of timing, study lead author Chris Stokes, from the United Kingdom's Durham University, said in a statement that "rates of 1 centimeter per year are not out of the question within the lifetime of our young people."
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There are currently around 8.18 billion people on the planet. The study—funded by the United Kingdom's Natural Environment Research Council—says that "continued mass loss from ice sheets poses an existential threat to the world's coastal populations, with an estimated 1 billion people inhabiting land less than 10 meters above sea level and around 230 million living within 1 meter."
"Without adaptation, conservative estimates suggest that 20 centimeters of [sea-level rise] by 2050 would lead to average global flood losses of $1 trillion or more per year for the world's 136 largest coastal cities," says the study, also co-authored by University of Wisconsin-Madison professor Andrea Dutton and University of Massachusetts Amherst's Rob DeConto in the United States.
DeConto said Tuesday that "it is important to stress that these accelerating changes in the ice sheets and their contributions to sea level should be considered permanent on multigenerational timescales."
"Even if the Earth returns to its preindustrial temperature, it will still take hundreds to perhaps thousands of years for the ice sheets to recover," the professor explained. "If too much ice is lost, parts of these ice sheets may not recover until the Earth enters the next ice age. In other words, land lost to sea-level rise from melting ice sheets will be lost for a very, very long time. That's why it is so critical to limit warming in the first place."
Not really a surprise We are already committed to a 12m+ sea-level rise, sufficient to drown every coastal town and city on the planet The only question is how long will this take www.theguardian.com/environment/...
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— Prof Bill McGuire (@profbillmcguire.bsky.social) May 20, 2025 at 7:50 AM
While the paper sparked some international alarm, Stokes highlighted what he called "a reason for hope," which is that "we only have to go back to the early 1990s to find a time when the ice sheets looked far healthier."
"Global temperatures were around 1°C above preindustrial back then, and carbon dioxide concentrations were 350 parts per million, which others have suggested is a much safer limit for planet Earth," he said. "Carbon dioxide concentrations are currently around 424 parts per million and continue to increase."
The new paper continues an intense stream of bleak studies on the worsening climate emergency, and specifically, looming sea-level rise. Another, published by the journal Nature in February, shows that glaciers have lost an average of 273 billion metric tons of ice annually since 2000.
Despite scientists' warnings, the government whose country is responsible for the largest share of historical planet-heating emissions, the United States, is actually working to boost the fossil fuel industry. Upon returning to office in January, U.S. President Donald Trump declared an "energy emergency" and ditched the Paris agreement.
Responding to the new study on social media, Scottish ecologist Alan Watson Featherstone called out both the U.S. and U.K. governments. He said that with many countries "scaling back their already meager and [totally] inadequate actions to address climate breakdown, our present-day human culture is on a suicide course."
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Trump’s America First Agenda Threatens the Fight Against Global Poverty
As it retreats from multilateralism, the Trump administration is rejecting the U.N. Sustainable Development Goals, which provide a blueprint to eradicate poverty and pursue inclusive and environmentally responsible economic development.
May 20, 2025
On March 4, 2025, Edward Heartney, a minister-counselor at the U.S. mission to the United Nations, remarked at the General Assembly that the Sustainable Development Goals “advance a program of soft global governance that is inconsistent with U.S. sovereignty” and interests.
This rejection of the SDGs aligns with President Donald Trump’s retreat from multilateralism and overall dissatisfaction with the U.N. For example, the Trump administration has moved to pull the United States out of the U.N. Human Rights Council, the Paris agreement on climate action, and the World Health Organization (WHO). In addition, the administration has frozen foreign aid, initiated a global trade war, and failed to pay its U.N. dues as of May 2025.
How can we remodel institutions and programs to be less dependent on American funds while also ensuring the continual engagement of the United States as a leader?
Although intended to prioritize the United States, these developments threaten progress on the SDGs, with negative implications for the global fight against poverty.
What are the Sustainable Development Goals?
The SDGs are a collection of 17 goals set for achievement by 2030, subdivided into targets and indicators. They form the core of the 2030 Agenda for Sustainable Development, adopted by all U.N. member states in 2015. They provide a blueprint to eradicate poverty and pursue inclusive and environmentally responsible economic development under conditions of peace and partnership.
Contrary to Heartney’s claims on sovereignty, the 2030 Agenda is voluntary and non-binding. They are a framework, not a prescription. In fact, the SDGs have not received nearly enough policy and financial support as evidenced by their lack of progress. Although there has been progress in some areas, only 17% of SDG targets are on track to be achieved according to the 2024 SDG report.
How, though, does the America First agenda impact global poverty? While many linkages can be draw, SDGs 3, 5, and 13 provide some examples.
SDG 3: Good Health and Well-Being
SDG 3 covers a wide range of health issues. There are strong correlations between a country’s income status and its performance on some SDG 3 indicators. For example, 2019 data places the cause of death by communicable diseases and maternal, prenatal, and nutrition conditions in low-income countries at 47%, versus only 6% for high-income countries.
Poor health is not only a symptom of poverty. It can compound cycles of poverty through inhibiting disabilities, crippling medical expenditures, and premature death. Meanwhile, the significance of American support for good health across the developing world cannot be overstated, and actions such as freezing foreign aid and cutting the UNAIDS budget are projected to cause the deaths of more than 200,000 people from AIDS and tuberculosis alone by the end of 2025.
However, on the positive side, in South Africa—the country with the highest number of people with HIV-AIDS—the government has committed to provide support for HIV-AIDS treatment in 2025 from the National Treasury, aiming to become a more self-sufficient country.
SDG 5: Gender Equality
There are positive links between improving girls’ and women’s access to health services, education, and economic opportunities and the overall living standards of a country. Hence, SDG 5 aims to end discrimination against girls and women and empower them with equal means. However, the Trump administration’s anti-diversity, equity, and inclusion (DEI) policy risks undermining work and advocacy for SDG 5. While this anti-DEI policy promotes merit-based systems and unity on its face, the administration is also using this campaign to target gender-related programs.
Additionally, by February 20, 2025, the freeze on humanitarian assistance resulted in more than 900,000 women per week being denied contraception around the world. Family planning activities were also not part of a limited waiver to the freeze, aligning with the administration’s overall anti-family planning policies. However, support for civil society organizations working on sexual and reproductive health and rights, and volunteerism, can help plug gaps. For example, 200 U.N. Volunteers recently worked with the WHO in the Republic of the Congo to raise awareness about HIV-AIDS and to challenge related stigma via a social media campaign.
SDG 13: Climate Action
The Trump administration’s rejection of the Paris agreement also aligns with support of an “overdue course correction on… climate ideology, which pervade the SDGs,” in the words of Heartney. The Paris agreement—the preeminent international treaty to combat climate change—is essential to SDG 13. Without the participation of the United States, which is the second largest emitter of greenhouse gasses in the world, the Paris agreement and SDG 13 are set to fail.
However, at this stage, climate action is not an “ideology” but a necessity, and the Green transition is not with its own economic opportunities that could advantage the United States.
Similar to the case of SDG 3, not only do low-income households experience the worst impacts of climate change, these impacts can compound poverty through property damage, income disruptions, displacement, and premature death. This further threatens progress on SDG 1.1 (extreme poverty), which has been one bright spot of success amid the ailing SDGs. For example, between 1990 and 2019, the prevalence of extreme poverty in developing Asia fell from 58% to 5%. Climate change, however, could push millions back into extreme poverty by 2030.
Fortunately, efforts like AMERICA IS ALL IN commit Americans to the Paris Agreement even as climate action is moving forward on other fronts. For example, Green bonds have seen rapid growth—rising from $40 billion in 2015 to more than $500 billion in 2023—with the United States being a top issuer in that period.
Looking Forward
In mid-July, New York will host the High-Level Political Forum on Sustainable Development (HLPF), which will review five SDGs, including SDGs 3 and 5. The HLPF provides an opportunity to have important conversations about these issues, and to find solutions.
For example, although the SDGs need the participation of the United States, how can we remodel institutions and programs to be less dependent on American funds while also ensuring the continual engagement of the United States as a leader? The recently adopted Pact for the Future—while not without flaws—also offers an impetus for discussions on why multilateralism is retreating. Finally, it is important to continue leveraging the potential of SDG localization in light of insufficient national action and leadership.
When it comes to multilateral action, the Trump administration is about to prove that the United States is not, in fact, an indispensable nation.
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