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I read that theory in the Guardian. https://www.theguardian.com/environment/2019/jan/31/european-colonization-of-americas-helped-cause-climate-change Great connection to the freezing of the Thames
Jared Diamond shared a theory in Guns, Germs and Steel that the mini ice age in the sixteenth century was caused by the deaths of 95 percent of the inhabitants of the Americas from diseases following Columbus, leading to widespread re-vegetation that caused climate change. That may have been discredited now.