Posted: 12/28/2016 10:34:00 PM EDT
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https://en.wikipedia.org/wiki/Ice_age
Looks like Global Warming may be a thing from this article, and has been going on for about 10-15,000 years. Considering Human civilization has only picked up speed in the last 2,000 years of so, it's safe to say humans aren't causing this or the last 5 warming periods. 
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