WEBVTT FILE 1 00:00:00.000 --> 00:00:01.710 Climate models predict longer 2 00:00:01.730 --> 00:00:04.500 and more severe droughts in a new NASA study. 3 00:00:04.520 --> 00:00:06.330 By the end of the 21st century, 4 00:00:06.350 --> 00:00:08.130 droughts in the southwestern U.S. 5 00:00:08.150 --> 00:00:10.180 may last more than 30 years. 6 00:00:10.200 --> 00:00:13.430 Scientists say this is due to human-caused climate change. 7 00:00:13.450 --> 00:00:14.995