Thursday, February 12, 2015

Worst Megadroughts in 1,000 Years Threaten US

Before this century ends, the Southwest and Central Plains states are likely to shrivel under a decades-long megadrought worse than those that ended the Ancestral Pueblo civilization in the last millennia, a new study finds. Based on tree-ring records, scientists know that severe droughts coincided with the collapse of the Ancestral Pueblo culture. After analyzing climate models that include ...

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