There is no precedent in contemporary weather records for the kinds of droughts the countrys West will face, if greenhouse gas emissions stay on course, a NASA study said. No precedent even in the past 1,000 years. The feared droughts would cover most of the western half of the United States -- the Central Plains and the Southwest. Those regions have suffered severe drought in recent years. But it doesnt compare in the slightest to the megadroughts likely to hit them before the century is over due to global warming.
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