Daily Climate Report (10).

Today is Thursday 21st September 2023. The atmospheric CO2 level for yesterday, the 20th, was 418.58 ppm, according to CO2 Earth, up from 416.32 ppm on 20th September 2022 - an increase of 2.26 ppm, or 0.543% p.a.

418.58 ppm = 811.1 mg/m^3 = 3,266.732 GtCO2, and is 2.42 ppm below the maximum CO2 level recorded for the KM5c marine isotope stage (3.205 Mya) of the Mid-Piacenzian Warm Period (MPWP) of the Pliocene Epoch, when global warming above the pre-industrial (1750) level was ~3°C.

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