Atmospheric concentrations of major greenhouse gases reached unprecedented highs in 2025, according to a report released Tuesday by the World Meteorological Organization. Carbon dioxide levels climbed to 153% of preindustrial baselines, while methane and nitrous oxide also set record levels. Officials warn that heat-trapping gases continue to supercharge the global atmosphere, fueling heatwaves, storms, and floods. Climate experts further caution that an upcoming El Niño event could accelerate carbon accumulation even more in the coming year.
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