“In medieval times the California droughts coincided roughly with a warmer climate in Europe, which allowed the Vikings to colonize Greenland and vineyards to grow in England, and with a severe dry period in South America, which caused the collapse of that continent's most advanced pre-Inca empire, the rich and powerful state of Tiwanaku, other recent studies have found.”
http://www.nytimes.com/1994/07/19/science/severe-ancient-droughts-a-warning-to-california.html
Link at maggiesfarm.
(Of course we modern humans will not allow a 200-year drought. We will fix the problem. Or something.)
*With apologies to John Hartford.
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