Greenhouse gas levels hit record highs in 2025, UN says

Summary

Concentrations of the three main greenhouse gases in the atmosphere (carbon dioxide, methane and nitrous oxide) all rose to record highs in 2025, the United Nations said on Tuesday. The UN's weather and climate agency, the World Meteorological Organization (WMO), said the rise will lead to more long-term temperature increases, and the greenhouse gases already in the air lock in climate impacts that will persist for centuries.

Timeline

1. RTÉ

   27 Oct 2026, 09:29 UTCSource ↗

   Reports that greenhouse gas concentrations in the atmosphere rose to new record highs in 2025, locking in climate impacts that will persist for centuries to come, according to the United Nations.

2. South China Morning Post

   27 Oct 2026, 10:08 UTCSource ↗

   Reports that greenhouse gas concentrations rose to record highs in 2025, with carbon dioxide, methane and nitrous oxide all at unprecedented levels, locking in climate impact for centuries, according to the UN's WMO.

3. CBS News

   27 Oct 2026, 11:55 UTCSource ↗

   Reports that greenhouse gas concentrations in the atmosphere rose to record highs in 2025, locking in climate impacts that will persist for centuries, according to the U.N.

4. Phys.org

   27 Oct 2026, 14:02 UTCSource ↗

   Reports that greenhouse gas concentrations in the atmosphere rose to new record highs in 2025, locking in climate impacts that will persist for centuries, according to the United Nations.

5. Phys.org

   27 Oct 2026, 16:40 UTCSource ↗

   Reports that carbon dioxide and other major greenhouse gases reached unprecedented highs in 2025, locking in more long-term warming, according to a new WMO report.