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The Keeling Curve

keelingcurve.bsky.social

did:plc:rp3fspydnlivnhkcqjyemf2j

423.72 parts per million (ppm) CO2 in air 22-Sep-2025 keelingcurve.ucsd.edu https://keelingcurve.ucsd.edu/

2025-09-23T16:12:05.207Z