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October 2024 Atmospheric CO2 - 422.38 ppm; October 2023 418.82 ppm; October 2022 415.74 ppm [View all]
Since October is the annual low point for atmospheric CO2 content, we will never see 420 ppm again in the lifetime of this civilization - or 422 ppm for that matter.
https://gml.noaa.gov/ccgg/trends/
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