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December 2025 Atmospheric CO2 Content 427.49 ppm; December 2024 425.40 ppm; December 2023 421.86 ppm
It's possible that we may pass 430 ppm in January. If we don't, we certainly will in February.
https://gml.noaa.gov/ccgg/trends/
https://gml.noaa.gov/ccgg/trends/data.html