|Two men ride bicycles on the riverbed of the Little Missouri River in North Dakota in June 2017.|
(Associated Press photo by Carey J. Williams)
Human-caused global warming is a big contributor to an emerging megadrought in North America, according to the study. Thus far, it has been mostly seen in the Western U.S., with California clocking a record-dry February and Western states fighting over who gets the water rights that once belonged to shuttered coal plants. Midwestern states, meanwhile, have seen record precipitation over the past few years.