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Did this occur? Could it have occurred?

It's widely accepted that pre-industrial and even pre-agricultural humans affected the environment (hunting megafauna to extinction, exhausting local forest or soil resources), but did human activities prior to the 1700s affect atmospheric carbon dioxide levels and global cooling and warming trends in historic times?

For instance, did the crash of Amerindian populations in the century after contact intensify or cause the severe cooling trends of the 1600s? Mechanism could have been reduction in carbon dioxide producing human population, maybe compounded by reforestation of depopulated lands.

On the other hand, the introduction of new world crops like potatoes and maize enabled major expansion of cultivation and in turn of old world populations from Ireland to China. In terms of global population levels, I wonder if increased populations in the old world simultaneously offset or more than offset the new world population crash.
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