Has U.S. Entered The Era Of 'Mega-droughts'?

February 15, 2015 8:44 PM

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A recent study reveals, before this century ends, the Southwest and Central Plains states are prone to shrink under a decades-long megadrought worse than those that ended the Ancestral Pueblo civilization in the most recent centuries.

In light of tree-ring records, researchers realize that extreme droughts coincided with the breakdown of the Ancestral Pueblo society. Great droughts struck in the 1100s and 1200s, in the meantime as the abandoned of the stone towns at Mesa Verde, Chaco Canyon and somewhere else on the Colorado Plat...

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