Megadroughts once reigned supreme in Southwest — and may again

USA Today: As the southern tier of the USA suffers through a drought that stretches from Arizona to Virginia – a distance of some 2,000 miles – new research this week finds that "megadroughts" used to be a common feature of the southwestern USA, and may be again, thanks to our favorite villain, climate change. These "megadroughts" lasted for, um, millennia, which I think is a long, long time. The authors, in a study published this week in the British journal Nature, say that "megadroughts" were a regular......

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