Carbon dioxide (COâ‚‚) averaged ~414 ppm in December 2020. 10 years ago December averaged ~390 ppm. + Graphic (@NOAA_ESRL): https://esrl.noaa.gov/gmd/ccgg/trends/mlo.html……
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Carbon dioxide (COâ‚‚) averaged ~414 ppm in December 2020. 10 years ago December averaged ~390 ppm. + Graphic (@NOAA_ESRL): https://esrl.noaa.gov/gmd/ccgg/trends/mlo.html……