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.…