According to the latest “Greenhouse Gas Bulletin” issued by the World Meteorological Organization on October 27, the greenhouse gas concentration in the atmosphere reached an unprecedented high in 2025, with an average carbon dioxide concentration of 426.8 parts per million, equivalent to 153% of the pre-industrial level in 1750, up 2.8 parts per million from 2024; methane and nitrous oxide concentrations reached 267% and 126% of pre-industrial levels, respectively. The report warns that the strong El Niño phenomenon may further increase carbon dioxide concentrations in 2026, and that high temperatures, droughts, and wildfires will reduce the ability of terrestrial ecosystems to absorb carbon dioxide.

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