WMO: Atmospheric Greenhouse Gases Hit Record Highs Again

The World Meteorological Organization reports record levels of greenhouse gases in 2025, with CO2, methane, and nitrous oxide all setting new highs. Concentrations have risen over 50% since 1990, and due to CO2's long lifetime, the climate impact will persist for centuries. This continues a well-established upward trend, underscoring the failure of current mitigation efforts.

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