Greenhouse gas levels reached new records in 2025, WMO bulletin says
Carbon dioxide averaged 426.8 parts per million at the Earth's surface last year, the World Meteorological Organization said on 27 October, with methane and nitrous oxide also at record highs.
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The World Meteorological Organization (WMO) said on 27 October 2026 that the concentrations of the three main long-lived greenhouse gases in the atmosphere all reached new highs in 2025. The figures come from its annual Greenhouse Gas Bulletin.
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