What was the co2 concentration in the atmosphere in 1850?
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Atmospheric Carbon Dioxide (CO2) and Methane (CH4) levels, 1850-present. CO2 and CH4 atmospheric dry molar fraction (ppmv), averaged over a calendar year CO2 (ice cores) CO2 (Mauna Loa) CH4 (ice cores) CH4 (Mauna Loa) 1840 1860 1880 1900 1920 1940 1960 1980 2000 2020 275 300 325 350 375 400 ppmv 1.0 2.0 3.0 ppmv.
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