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Atmospheric concentrations of carbon dioxide, methane and nitrous oxide all rose to record or unprecedented levels in 2025, according to findings reported by the World Meteorological Organization.
New Scientist reported that other greenhouse gases increased as well, including a lesser-known gas with a stronger warming effect. The supplied reporting does not identify that gas or provide numerical concentration levels.
South China Morning Post reported that the United Nations said the elevated concentrations would contribute to climate impacts lasting for centuries. The paper also reported that the World Meteorological Organization linked the rise to further long-term temperature increases, although the available evidence does not specify their scale or precise duration.