WMO’s Greenhouse Gas Bulletin 2023

On October 28, 2024, the World Meteorological Organization (WMO) released its annual Greenhouse Gas (GHG) Bulletin for the year 2023.

Key Findings

  • Record GHG Concentrations: Annual Increase (2022-2023) by2.3 ppm, marking the 12thconsecutive year of increases over 2 ppm.
  • CO2 Levels: Reached 420 ppm, similar to levels seen 3-5 million years ago, when:
    • Global temperatures were 2-3°C higher.
    • Sea levels were 10-20 meters higher.
  • Methane: Largest three-year increase (2020-2022) recorded.
    • Linked to natural wetland emissions under La Niña conditions.
  • Nitrous Oxide: Increase from 2022 to 2023 was lower than the peak increase recorded in ....
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