During the Ice Age, volcanism due to isostatic adjustment was rampant such that the amount of carbon gas in the atmosphere was much greater than today, in effect by the addition of carbon 12 (from CO2) diluting the radioactive carbon 14 already in the atmosphere such that carbon 14 dates of material from the Ice Age are sometimes greatly exaggerated, and notice that the greater volume of carbon gas during the Ice Age contradicts the notion that carbon gas causes global warming!
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