Daily Climate Report (8).

Today is Tuesday 19th September 2023. The latest atmospheric CO2 reading, from the Keeling Curve (today's date), is 418.54 ppm = 811.1 mg/m^3 = 3,266.42 GtCO2.

This is 2.46 ppm below the maximum atmospheric CO2 level (421 ppm) of the KM5c marine isotope stage (~3.205 Mya = million years ago) of the Mid-Piacenzian Warm Period (MPWP, 3.3-3 Mya) of the Pliocene Epoch (5.3-2.588 Mya), which had a similar Earth orbital configuration to the present, but had global warming of ~3°C above the pre-industrial level, and sea-levels ~20 m higher than today  (see de la Vega et al, 2020).

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