JUST IN: Atmospheric carbon dioxide (CO2) concentrations have peaked for the year at 430.5 ppm.
The 2025 peak is 3.6 ppm higher than last year and the second largest May-May increase in the 67-year Mauna Loa record. In 2023, the CO2 peaked at 424 ppm.
To learn how increasing concentrations of atmospheric CO2 influence our Earth system: https://gml.noaa.gov/education/carbon_toolkit/basics.html
See the trends: https://gml.noaa.gov/ccgg/trends/
