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It was also the first time that the three-year temperature average broke through the threshold set in the 2015 Paris Agreement of limiting warming to no more than 1.5 degrees Celsius since preindustrial times.
Experts say that keeping the Earth below that limit could save lives and prevent catastrophic environmental destruction around the globe.
Researchers cited the continued burning of fossil fuels — oil, gas and coal — that send planet-warming greenhouse gases into the atmosphere.
“If we don’t stop burning fossil fuels very, very, quickly, very soon, it will be very hard to keep that goal” of warming, Friederike Otto, co-founder of World Weather Attribution and an Imperial College London climate scientist, told The Associated Press. “The science is increasingly clear.”
Extremes in 2025
Extreme weather events kill thousands of people and cost billions of dollars in damage annually.
WWA scientists identified 157 extreme weather events as most severe in 2025, meaning they met criteria such as causing more than 100 deaths, affecting more than half an area’s population or having a state of emergency declared.
Of those, they closely analysed 22.
That included dangerous heat waves, which the WWA said were the world’s deadliest extreme weather events in 2025.
The researchers said some of the heat waves they studied in 2025 were 10 times more likely than they would have been a decade ago due to climate change.
“The heat waves we have observed this year are quite common events in our climate today, but they would have been almost impossible to occur without human-induced climate change,” Otto said. “It makes a huge difference.”
Meanwhile, prolonged drought contributed to wildfires that scorched Greece and Turkey.
Torrential rains and flooding in Mexico killed dozens of people and left many more missing.
Super Typhoon Fung-wong slammed the Philippines, forcing more than a million people to evacuate. Monsoon rains battered India with floods and landslides.
The WWA said the increasingly frequent and severe extremes threatened the ability of millions of people across the globe to respond and adapt to those events with enough warning, time and resources, what the scientists call “limits of adaptation.”
The report pointed to Hurricane Melissa as an example: The storm intensified so quickly that it made forecasting and planning more difficult, and pummeled Jamaica, Cuba and Haiti so severely that it left the small island nations unable to respond to and handle its extreme losses and damage.
Global climate negotiations sputter out
Officials, scientists, and analysts have conceded that Earth’s warming will overshoot 1.5 degrees Celsius, though some say reversing that trend remains possible.
Yet different nations are seeing varying levels of progress.
“The geopolitical weather is very cloudy this year with a lot of policymakers very clearly making policies for the interest of the fossil fuel industry rather than for the populations of their countries,” Otto said.
“And we have a huge amount of mis- and disinformation that people have to deal with.”
Andrew Kruczkiewicz, a senior researcher at the Columbia University Climate School who wasn’t involved in the WWA work, said places are seeing disasters they aren’t used to, extreme events are intensifying faster and they are becoming more complex.
That requires earlier warnings and new approaches to response and recovery, he said.
“On a global scale, progress is being made,” he added, “but we must do more.”
