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(Bloomberg) — Global temperatures through August were 1.4C higher than the average before the industrial age, putting 2025 on track to be one of the hottest years on record, according to the World Meteorological Organization.
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Going all the way back to the middle of the 1800s, no decade has been hotter than the 10 years through 2025, the WMO said in a report released on Thursday to coincide with the arrival of global leaders in the Brazilian city of Belém for the COP30 summit. The UN-sponsored climate talks mark the 10th anniversary of the Paris Agreement in which countries agreed to cut emissions in order to keep global warming close to 1.5C by 2100.
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“This unprecedented streak of high temperatures, combined with last year’s record increase in greenhouse gas levels makes it clear it will be virtually impossible to limit global warming to 1.5C in the next few years without temporarily overshooting this target,” said WMO secretary general, Celeste Saulo. “But the science is equally clear that it’s still entirely possible and essential to bring temperatures back down to 1.5C by the end of the century.”
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Atmospheric concentrations of greenhouse gases continued to rise in 2025, as did ocean heat and sea levels, the WMO said. Sea ice in Antarctica has remained below average throughout the year, while extreme weather- and climate-related events impacted livelihoods and food systems, and contributed to the displacement of people.
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Drought and storms in particular impacted power supply and demand for energy globally, the WMO said. Dry conditions across South America in 2024 led to lower hydropower output, while in Southern Africa above average winds driven by El Niño led to a 3.4% increase in wind power supply. High temperatures led to a 4% increase in power demand globally in 2024, relative to the average between 1991 and 2020.
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