Abstract
Recent indirect data and direct measurements from ice cores point towards a ‘pre-industrial’ CO2 level of around 260–270 ppmv, considerably below the commonly assumed value of 290 ppmv. Early measurements from the southern hemisphere tend to favour the lower value.
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Wigley, T.M.L. The pre-industrial carbon dioxide level. Climatic Change 5, 315–320 (1983). https://doi.org/10.1007/BF02423528
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DOI: https://doi.org/10.1007/BF02423528