Quote:
Originally Posted by H-Tom
So how you explain that 1000 years ago it was warmer than now? Who caused it, crusaders?
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Easy: the amount of carbon dioxide in the atmosphere is not the only factor contributing to the climate. That doesn't exactly answer to the question, but I don't know the answer; maybe sun was closer, maybe it was more active, or maybe it was the CO2 after all, maybe there were some large vulcanic eruptions, or maybe a combination of these.