SETH BORENSTEIN AP Science Writer KENSINGTON, Maryland (AP) — A two-decade-long dry spell that has parched much of the western United States is turning into one of the deepest megadroughts in the region in more than 1,200 years, a new study found. And about half of this historic drought can be blamed on man-made global warming, according to a study in Thursday's journal Science. Scientists looked at a nine-state area from Oregon and Wyoming down through California and New Mexico, plus a sliver of southwestern Montana and parts of northern Mexico. They used thousands of tree rings to compare a drought that started in 2000 and is still going — despite a wet 2019 — to four past megadroughts since the year 800. With soil moisture as the key measurement, they found only one other dr
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