WMO – Greenhouse Gas Bulletin No. 20, Oct 2024

The World Meteorological Organization's Greenhouse Gas Bulletin No. 20, released in October 2024, reports that atmospheric levels of the three main greenhouse gases—carbon dioxide (CO₂), methane (CH₄), and nitrous oxide (N₂O)—reached new record highs in 2023. The bulletin highlights that CO₂ concentrations hit a new high of 420 parts per million (ppm) last year, up 2.3 ppm from a year earlier, and they have risen by 11.4% in just 20 years. Reuters This increase is attributed to both natural and anthropogenic sources, including fossil fuel combustion and deforestation. The report underscores the urgent need for enhanced global efforts to reduce greenhouse gas emissions and mitigate climate change impacts.