Guardian: In Rancho Mirage, southern California, lush private gardens flourish in absurd contrast to the parched surrounding landscape. But green lawns like these are under threat, as the drought that has plagued the state since 2012 refuses to let up. In January last year, when rainfall figures for the preceding 12 months slumped to the lowest levels since records began in 1885, governor Jerry Brown declared a state of emergency. He is now enforcing residential water restrictions after another snowless winter....