Correlation does not imply causality, but the absence of correlation proves conclusively the absence of causality.Atmospheric CO2 concentration and ΔRFCO2 are generally uncorrelated with T.This study demonstrates that changes in atmospheric CO2 concentration did not cause temperature change in the ancient climate [nor does it in present climate].The present findings corroborate the earlier conclusion based on study of the Paleozoic climate that “global climate may be independent of variations in atmospheric carbon dioxide concentration.”The present study shows further, however, that past atmospheric CO2 concentration oscillates on a cycle of 15–20 My and an amplitude of a few hundred to several hundreds of ppmv.
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