Evidence of drought has been mounting. A 2012 study in the journal Science analyzed a 2,000 year old stalagmite from a cave in Belize and also “found that sharp decreases in rainfall coincided with periods of decline in the culture,” said Discovery.
http://www.washingtonpost.com/news/morning-mix/wp/2014/12/30/more-evidence-mayan-civilization-collapsed-because-of-drought/
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