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UN weather agency confirms hottest decade on record

The UN's World Meteorological Organization reports 2015-2025 as the hottest decade with 2025 about 1.43°C above pre-industrial levels and record ocean heat uptake.

  • On Monday, the World Meteorological Organization released its State of the Global Climate report, confirming 2015–2025 as the hottest 11 years on record.
  • Rising greenhouse gas concentrations have pushed carbon dioxide, methane, and nitrous oxide to record levels, while WMO scientists found Earth's energy imbalance reached a new high in 2025.
  • Data show ocean heat content reached a record high last year, with oceans absorbing more than 91% of excess heat and global mean temperature about 1.43°C above pre-industrial in 2025.
  • Communities worldwide face extreme events in 2025—heatwaves, wildfires, droughts, cyclones and floods—that caused thousands of deaths, billions in losses, worsening food insecurity, dengue risks, and displacement.
  • Looking ahead, forecasters expect neutral conditions by mid-2026, with a possible El Niño later, as WMO chief Celeste Saulo said: 'Human activities are increasingly disrupting the natural equilibrium and we will live with these consequences for hundreds and thousands of years.
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The last eleven years are the hottest recorded, and that data, repeated year after year, ceases to be an anomaly to become a structural signal of the climate system: the planet is not only warming up, it is entering a sustained phase of unprecedented energy imbalance in the modern era. The latest report of the World Meteorological Organization (WMO) confirms that 2025 is between the second and third year warmer in 176 years of records, with a gl…

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Geneva. The amount of heat accumulated by the Earth reached a record level in 2025, with possible consequences for hundreds – and even thousands – of years, warned the World Meteorological Organization (WMO), a UN agency, on Monday.

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The average surface temperature last year was 1.43 degrees Celsius above pre-industrial levels.

Center

Earth is in imbalance. That is the message of a United Nations report published on Sunday night, which analyzes how much energy from the sun absorbs the Earth or is reflected back into space. Researchers found that the difference between the two is the largest since measurements began in 1960, which means that now more of the sun’s thermal energy remains on Earth. And that energy imbalance is warming the oceans, the atmosphere and the frozen reg…

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Al-Monitor broke the news in Washington, United States on Monday, March 23, 2026.
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