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The World Meteorological Organization reports that global concentrations of carbon dioxide, methane, and

2025 in climate change — The World Meteorological Organization reports that global concentrations of carbon dioxide, methane, and nitrous oxide reached record highs in 2025, with carbon dioxide averaging 4

Published October 27, 2026· Updated October 28, 2026·1 min read

Context: 2025 in climate change.

The World Meteorological Organization reports that global concentrations of carbon dioxide, methane, and nitrous oxide reached record highs in 2025, with carbon dioxide averaging 426.8 parts per million. [https://www.france24.com/en/live-news/20261027-greenhouse-gas-levels-hit-new-record-highs-in-2025-un (AFP via France 24)]

Event summary via Wikipedia Current Events (2026-10-27).