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"With ocean temperatures at these levels and El Niño on the horizon, we are likely to see more temperature records fall in the coming months."
A new report released Wednesday shows that surface temperatures of the world's oceans hit a record for June, sparking fresh warnings of grave “consequences for weather patterns, global climate and marine ecosystems” across the globe.
The analysis by the European Union’s Copernicus Marine Service, and confirmed by the Copernicus Climate Change Service (C3S), finds that “record global sea surface temperatures” of 21.0° Celsius (69.8° Fahrenheit) in June of 2026 beat the previous record in the same month broken in 2023 and again in 2024.
C3S director Carlo Buontempo warned that the "current conditions" of the oceans "could indicate the beginning of a new phase, leading, once more, to uncharted territory."
"With ocean temperatures at these levels and El Niño on the horizon, we are likely to see more temperature records fall in the coming months," Buontempo warned. "That Copernicus Marine data reaches the same conclusion through independent methods speaks to the strength of European science—and to why open, robust data matters now more than ever.”
According to a statement from Copernicus, warmer oceans have wide-ranging impacts on natural systems and human infrastructure, noting that "higher ocean temperatures keep the atmosphere warm for longer, provide extra energy to storms and increase evaporation, thus enhancing the potential for extreme precipitation and flooding. Ocean warming also contributes to sea level rise and ice melt, and stresses marine ecosystems."
With the onset of a new El Niño cycle—which tends to trigger more pronounced weather events worldwide—the continued increase of ocean temperatures is a serious concern of scientists.
Wednesday's report on ocean temperatures also arrives as record-breaking heat waves hit both Europe and North America, offering more evidence of the perils of an ever-hotter world that is being pushed to the brink by the burning of fossil fuels and the failure of governments worldwide to finally act against the fossil fuel industry that is driving the crisis.
Surging ocean surface temperatures are "not unexpected,” Michael Meredith, an ocean scientist at the British Antarctic Survey, told CNN in response to the Copernicus report. “But the pace of warming we are now seeing is alarming.”
A record-breaking European heatwave is one event that will help bring “climate” back into fashion in our discourse, and the coming El Niño will have the same effect.
One benefit of having watched the climate story from the start is that I tend not to panic when “climate” is temporarily eclipsed as an issue, almost always thanks to the hard work of Big Oil. It happened at the end of the 1980s after the initial furor over the newly public “greenhouse effect,” and again after the Kyoto climate talks; when Al Gore made global warming a central issue in the oughts, the collapse of the Copenhagen talks put it on the back burner. Many of us built the movement that pushed it back to the front again in the oughts, culminating in the Paris accords; when momentum wavered Greta Thunberg and her colleagues emerged, building the consensus that took us through the Inflation Reduction Act.
At the moment, of course, a resurgent fossil-funded right wing has killed off that landmark legislation, and done all it can to destroy clean energy in the US; America is out of the global climate talks; around the world various strongmen have made protest far more difficult. The new authoritarians have managed to intimidate many of the centrist pols in much of the world who are no longer willing to talk much about “climate;” indeed, there’s a closet industry of pundits and consultants advising them not to.
But it’s never occurred to me that this state of affairs would last very long—physics is running this show, and it won’t be long denied. And now I think we can see the next of these cycles firing off—and this one, I think, will be climactic. We have a chance to insure that civilization comes out of this one focused on the physical world.
The politics of climate begins with… climate. Perhaps you’ve heard that Europe spent the past week suffering through a truly remarkable heatwave, with France reaching a new all-time record temperature, the UK recording its hottest day ever, Spain smashing all its old marks. It’s truly brutal—and it recalls, for Europeans, the heatwave of 2003, which ended up killing 70,000 people. Even today, the continent is ill-prepared for extreme heat—in France, for instance, Angelique Chrisafis reports that:
The impact of the heatwave has been made considerably worse by the high proportion of French buildings and infrastructure not designed to cope with high temperatures. Paris, one of Europe’s most densely populated cities, known for its poorly insulated housing stock, has for years been considered to have the highest heatwave mortality risk of any capital on the continent. The French government has been criticised for a lack of preparation and for cutting funding for projects designed to adapt infrastructure to the climate crisis.
Half of all French homes have insufficient protection from high temperatures, leaving inhabitants dangerously overheated, a report for the NGO Fondation pour le Logement (Foundation for Housing) found this month. About 66% of French people struggle to tolerate the heat in their homes.
Maïder Olivier, the head of climate advocacy at the NGO, said France had a “massive and worsening problem of heat-trap housing.” She said climate inequality in France was growing, with low-income, suburban housing estates suffering the worst from heatwaves.
Apparently English homes, especially modern ones, aren’t much better. And the heat has caused a surge in British hospital admissions, even as it’s damaged hospital equipment. Andrew Gregory writes:
Several NHS trusts in England have declared critical incidents as a direct result of the extreme heat. One hospital had done so after its machines failed in multiple areas, a doctor said. Labs used for testing were also affected and two linear accelerator machines, used to treat cancer patients, had stopped working amid the high temperatures.
The doctor said that although they were working in a relatively new care setting, it was “tacked on to an old Victorian hospital,” creating severe infrastructure challenges. “It’s hopeless, really,” they said.
The doctor also said their NHS trust had faced “major issues” with IT servers overheating on Wednesday. “We thought we were going to lose everything, so we were all asked to turn off non-essential computers and electrical equipment, including lights.”
But it’s not just dialysis machines going down—in France, nuclear reactors had to be taken offline because the river water used for cooling was getting too warm. Also, save some tears for the poor American tourists complaining to The Wall Street Journal that European restaurants offer too few ice cubes in their drinks.
Look, there’s no doubt why these records are being smashed—as Bob Henson writes at Eye on the Storm:
Extreme heat is among the most-studied consequences of human-caused climate change, and the connections between a warming planet and amplified, localized extreme heat are not only intuitive but well documented.
In this case the jet stream—powered by the temperature differential between the poles and the equator, and unsettled by the melt up north—has gone kaflooey, producing what’s called an “omega block” for its distinctive shape. The sun beating down on this heat dome is relentless. As Lauren Dalban reports for Inside Climate News:
“There’s a sad inevitability to all of this, with scientists like me trotting out the same quotes year after year,” Friederike Otto, a professor of climate science at the Imperial College London who leads the World Weather Attribution, a group that works to link weather events to climate change, said in an email. “Simply put, we remain on a one-way trip towards a more dangerous future, and it’s time we hit the brakes.”
I could of course go on and on about the heat; it’s wretched. (And remember that we’re paying attention in part because there’s lots of media, some of it English-speaking, in Europe; similar hideous heatwaves have been plaguing much of Asia this spring). But what I really want to talk about is its political meaning—I think this heatwave is one of those events that will help bring “climate” back into fashion in our discourse.
Britain will be an interesting test case. Its politics have been roiled for the last two years by the odd static incompetence of Keir Starmer’s Labour government, now about to be replaced by the Andy Burnham government. A key question for that new administration will be the role of Ed Milliband, who has been serving as the energy secretary, and may be in line for a job as chancellor. He’s been (almost uniquely) effective in his role, moving fast to boost clean and cheap renewable energy in the UK.
But that’s roiled the fossil fuel industry, which is putting big money behind the right-wing Reform Party, which, according to an April investigation by Sam Bright and Adam Barnett, has collected two-thirds of its funding from oil interests. Together with the always vile Murdoch press, they’ve mounted a full-on attack on “Net Zero” policies, alleging—a la Murdoch’s Wall Street Journal in this country—that they’re responsible for rising energy prices in the UK.
The entire status quo is in on this fight—including British labor unions. They aren’t venal the way oil companies are, but they are fighting against change, in the name of their current members. And they’ve focused their fire on Milliband. Sharon Graham, head of the giant UNITE union, has said:
Jobs in Britain are important. We need someone in that role [chancellor] who understands that, and at the moment that isn’t Ed Miliband… It’s been floated that Ed Miliband would be chancellor, that would be a noose around the neck of what we need to do on jobs.
Happily, we’re starting to see serious pushback to this endless irresponsible climate delayism. It begins with scientists. In France eminent climate researchers have started speaking out to Le Monde, complaining about the inability of scientists to effectively connect the dots between climate change and heat for the public. British scientists have gone one better: Nine of them wrote the agency responsible for regulating the press to complain about the lame coverage:
News stories about heatwaves often do not mention the influence of climate change or the burning of fossil fuels on increased temperatures—for example, 3 in 5 stories during the May heatwave did not—while two-fifths of those about net zero make no mention of climate change. In this context, it is unsurprising that the public often do not understand these issues or the connection between them.
I think my favorite was a letter to the London Times from the veteran climate research Brian Hoskins of Imperial College London, which I reprint here just because I like its cadences:

The sentence “net zero is not an arbitrary slogan, rather it is dictated by the laws of physics” should be a watchword in the years to come.
And here’s my guess: Milliband will be vindicated, landing in an important new job. Despite the complaints of union leaders, Britain’s green economy is one of the few things that’s booming on the island. He’s not backing down: At a press conference last week he heralded the fact that more than a hundred billion pounds in private clean energy investments had been made during his term:
Experts told The Guardian that the new investment data, as well as previous findings by the Confederation of British Industry that the UK’s net zero economy had grown faster than the rest of the economy and generated higher-paying jobs… [contradicted the claims of union leaders]
Miliband said: “I’m proud to have led a pro-business, pro-growth department in these last two years. This achievement didn’t happen by accident, but because of clarity of mission, government investment, and building not blocking. As we have shown in energy, progressive government in hard times requires partnership with business to secure economic growth, built on an active industrial strategy.”
Indeed, 40 progressive economists in the UK wrote to the labor leaders this week, rejecting their attack on Net Zero:
There is no alternative to the green transition. The effects of climate change are with us now. Miliband is right to oppose further expansion of North Sea oil and gas.
If Burnham were to back off the Net Zero pledges, he’d be disappointing the 60% of Brits who like the strategy. Starmer staggered in part because he took right-wing positions on immigration, giving the Green Party an opening; that door will grow much larger if he backs off on climate policy, so I suspect he won’t.
And the heatwave will give him political cover to do the right thing. As the head of Greenpeace UK said last week:
The only way off this hellish treadmill is to reduce our dependence on fossil fuels. Our next prime minister needs to act on the evidence outside their window, and the advice of their scientific advisers, and stay the course on climate policies. The alternative is parched reservoirs, unaffordable food, shuttered hospitals and schools, and wildly fluctuating bills each time a new oil war is kindled.
My further guess is that the coming El Niño will have the same effect on global climate politics—and maybe even in our caboose of a nation. We enter this new warming spell in rough shape: Recent data shows the heat content of oceans at all-time highs. Things are grim enough that one (ghoulish?) investor has launched a fund designed to make money off the coming crisis:
Hedge fund Moreton Capital Partners is targeting $500 million for a special-purpose vehicle to trade multiple commodities that stand to be impacted by the weather phenomenon, including South African corn, Malaysian palm oil, and Australian wheat. The markets are underestimating risks, according to Moreton’s co-founder Les Finemore.
“We think it’s going to be a dramatic reshaping of the global food situation,” Finemore said in a video interview from Mexico City. “We feel like today the market is seriously mis-pricing that risk.”
American politicians may feel that the easiest course for the short term is to back off on climate talk—and the green movement is perhaps inclined to let them get away with it through the midterm elections, which will be fought largely as a referendum on the mendacity of the Trump administration. (Though it’s political malpractice not to be calling out Trump’s incredibly unpopular attacks on solar and wind energy). But next year, as primary season begins in earnest, El Niño will insure climate is firmly back on the agenda. And given the explosion in clean energy, the case will be easy for smart candidates to make.
That this cycle has gone on since the 1980s does not mean it can go on forever. We’re clearly reaching desperate physical tipping points. So this had better be the last turn of the wheel—by the end of the decade we need to have decisively broken the political power of the fossil fuel industry, so we can get on with the energy transition, and with building a world that can survive the damage Big Oil has inflicted.
It starts now.
"Europe's savage heatwave has the fingerprints of the climate crisis all over it—it's the latest price to pay for fossil fuel pollution baking our planet," said one UN leader.
With at least hundreds of people dead and high temperatures persisting, scientists said Friday that the "record-shattering" heatwave devastating Europe was "virtually impossible just 50 years ago"—and climate change driven by fossil fuel emissions "is unequivocally to blame."
World Weather Attribution (WWA), an international scientific collaboration that analyzes extreme weather events, said daytime highs and overnight temperatures that have been scorching several European countries likely could not have occurred in 1976, and a similar heatwave in that historic climate would be 6.3°F cooler.
The findings followed a Monday analysis from ClimaMeter showing that weather patterns similar to those driving the current European heatwave now produce temperatures roughly 3.6-7.2°F warmer, depending on location, than they did during the second half of the 20th century, because of greenhouse gas emissions.
"The sweltering overnight temperatures keeping many people awake this week are about 100x more likely today than they were just 23 years ago during the infamous 2003 European heatwave," WWA said Friday. "The daytime peaks are about 10x more likely."
WWA found that a "staggering" 45% of 854 cities across 30 European countries have broken, or are expected to break, their records for wet-bulb globe temperatures—which incorporate temperature, humidity, wind speed, and sunlight to measure the risk to humans.
"The science of how climate change is worsening heatwaves is settled. Continued fossil fuel emissions are directly responsible for the disruption people are experiencing this week in their homes, schools, and workplaces," said Theodore Keeping, a co-author of the WWA study who researches extreme weather and wildfire at the United Kingdom's Imperial College London (ICL).
"The speed of change is startling," Keeping continued. "Every few years, we are seeing heat records shattered in Europe. This year, it has been in consecutive months. In the UK, we are used to 'snow days' shutting down schools, but this generation is now growing up with 'heat days' as well."
While the "heat dome" responsible for Europe's second heatwave in two months "was moving east on Friday, bringing marginal relief to some areas in the west and threatening parts of Central and Eastern Europe with a scorching weekend," according to The New York Times, the 97.5°F recorded in southwest England was Britain's highest temperature ever for June, breaking a record set the previous day.
A record-breaking heat wave that’s spreading eastward across Europe has revived interest in a hypothetical temperature forecast for August 2050 in France.But it turns out, it didn’t take 36 years for those imagined temperatures to be reached — and even exceeded.
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— The Washington Post (@washingtonpost.com) June 25, 2026 at 12:30 PM
France also faced more intense heat on Friday, with a 103.3°F reading in Paris. The Washington Post pointed out that two days earlier, as parts of the country endured 112.3°F, soaring temperatures exceeded hypothetical forecasts for August 2050 in 19 of 34 locations across the French mainland.
The current conditions have proven deadly. As Reuters reported:
At least 48 people have died in France from drowning since the start of the heatwave while trying to cool off, authorities said, and three young children are known to have been killed by heat in cars in two separate incidents.
Since the end of last week, more than 20 people across Germany have died in swimming-related accidents, the German Life Saving Association said in a statement to Reuters.
Spain's Mortality Monitoring System estimated that the recent heat has resulted in at least 212 deaths, mostly among people ages 65 and older. Diana Gómez, a scientist at the agency, noted that the figures are preliminary and based on statistical projections.
Acknowledging that "many people still live, work, and study in places that are not designed for the temperatures we are now experiencing," Carolina Pereira Marghidan of the Red Cross Red Crescent Climate Center said to "follow local heat advice, seek cooler spaces where possible, drink plenty of water, and check on family, friends, and neighbors who may be most at risk."
Pereira Marghidan also highlighted the "growing gap between the pace of climate change and the pace of adaptation," and called for "greater investment in heat-resilient homes, cities, and infrastructure to keep people safe."
Right now, record-breaking, dangerous heat waves are rolling across Europe. This isn't just "summer weather". This is exactly what the climate crisis looks like 🥵
— Greenpeace International 🌍 (@greenpeace.org) June 24, 2026 at 7:57 AM
Speaking at London Climate Action Week on Wednesday, United Nations Secretary-General António Guterres similarly said that "climate adaptation is no longer about preparing for a distant future. It's about managing risks in real time—as the searing heat now gripping London and far beyond makes unmistakably clear."
"Our climate is changing faster than our systems, our infrastructure, and our institutions can handle. The World Meteorological Organization confirms that the past 11 years have been the hottest on record. Scientists now expect the world to exceed 1.5°C in the coming years," he continued, citing the Paris Agreement's goal to limit temperature rise this century. "We're entering a new era of climate risk."
The heat has sparked calls to tackle the root cause of the rising temperatures—fossil fuel emissions—from Guterres and others. UN Climate Change Executive Secretary Simon Stiell said Thursday that "Europe's savage heatwave has the fingerprints of the climate crisis all over it—it's the latest price to pay for fossil fuel pollution baking our planet."
"Schools closing, the vulnerable dying, economies sweating: This is what the climate crisis looks like in practice, and it's just getting started," he emphasized. "Until humanity stops burning colossal amounts of coal, oil, and gas, extreme heat will keep getting worse, and other climate impacts—from megadroughts, floods, wildfires, and storms—will keep hammering every economy and population harder each year."
David Ho, a University of Hawaii at Mānoa professor, said on social media: "The heatwave in western Europe is the most severe and widespread ever, with almost half of Europe's largest cities experiencing their worst ever heat stress, a combination of high temperatures and humidity. Unless we stop burning fossil fuels, future heat conditions will become even more extreme."
I spoke with Geeta GuruMurthy of BBC World News Television about the record European heat wave and it's link to human-caused warming:youtu.be/d8vqO2J8WV0
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— Michael E. Mann (@michaelemann.bsky.social) June 25, 2026 at 2:17 PM
Although some natural phenomena can contribute to high temperatures, and the National Oceanic and Atmospheric Administration announced earlier this month that El Niño, the warm phase of a recurring climate pattern in the Pacific Ocean, had formed, WWA found that it "had no role in driving the heat" in Europe.
"Scientists like me are beginning to sound like a broken record. We put out similar quotes year after year, reacting to heat extremes that climb ever higher. Yes this is climate change, yes it's us, no it's not El Niño, yes we have the solutions, no we're not implementing them fast enough," said study co-author and ICL climate science professor Friederike Otto. "It's really now a question of what kind of future we want for ourselves, and whether we're willing to do what it takes to secure it."
On the heels of a French court's ruling against TotalEnergies, Lisa Rose, a campaigner at the global climate group 350.org, argued Friday that "it's time to turn the heat on the fossil fuel giants that caused this heatwave but are doing nothing to cover the costs."
"Both science and the law are clear: Polluters must answer for climate damage. Now it's up to our leaders to make them pay," Rose said. "Forcing fossil fuel companies to cut emissions and pay their fair share is the only effective lasting response. Half-measures won't cool this crisis, only a faster shift to renewables can."