re: Scott Pruitt says carbon dioxide is not a primary contributor to global warming

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you should also know the medieval warming was local not global

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Was it, though? It seemed to coincide with a massive, decades long drought that collapsed the Mayan Civilization.

The increased rains resulted in greater grass production on the Mongolian Steppe, triggering the population boom which created the Ghengis Kahn's great Hordes.

It certainly seemed to coincide with a rapid expansion of the Polynesian culture accross the Pacific.