Add Yahoo as a preferred source to see more of our stories on Google. A worker moves irrigation tubes on a farm in Pinal County, Ariz. A two-decade drought has made water supplies harder to secure. Carolyn Cole/Los Angeles Times via Getty Images A new wave ...

(The Hill) – The combined effects of climate change and air pollution have led to direct declines in precipitation in the U.S. Southwest, making drought inevitable, a new study has shown. These circumstances, which began taking hold in about 1980, are ...