Greenhouse Gas Levels Set Records In 2025, UN Says

An anonymous reader quotes a report from CBS News: Greenhouse gas concentrations in the atmosphere rose to record highs in 2025, locking in climate impacts that will persist for centuries, the United Nations said on Tuesday. Levels of the three main greenhouse gases -- the climate-warming carbon dioxide, methane and nitrous oxide -- all rose to unprecedented figures in 2025, the U.N.'s weather and climate agency said. The World Meteorological Organization said the rise would lead to more long-term temperature increases for the planet.

The bulletin looks at greenhouse gas concentrations -- the amount of those gases in the atmosphere -- rather than new annual emissions amounts as the world burns more coal, oil and gas. In 2025, carbon dioxide concentrations were at 426.8 parts per million (ppm); methane at 1,948 parts per billion, and nitrous oxide at 339.1 parts per billion. That takes them, respectively, to 153%, 267% and 126% of the pre-industrial levels witnessed before 1750. Of the three major greenhouse gases, CO2 accounts for about 66% of the warming effect on the climate.