There’s a scene in the film Mad Max: Fury Road where the evil ruler Immortan Joe, gazing down from a cliff upon his parched, emaciated subjects, turns two turbines, and water gushes from three gigantic sluices. The wretched masses surge forward to catch the deluge in their pots and bowls. And as imperiously as he opened the gates, Joe shuts them. “Do not become addicted to water,” he roars. “It will take hold of you.” But, of course, he already has taken hold of them by withholding, essentially, life. We don’t have to await the dystopian future for the water