"10.1088/1748-9326/5/4/044012" . "Characterizing changes in drought risk for the United States from climate change"^^ . . "5" . "2010"^^ . "10.1088/1748-9326/5/4/044012" . . . _:genid1 . _:genid1 . _:genid1 . _:genid1 . _:genid1 . _:genid2 . _:genid2 . _:genid2 . _:genid2 . _:genid2 . _:genid3 . _:genid3 . _:genid3 . _:genid3 . _:genid3 . . . . . . . . . . . . . . .