A recent United Nations report on drought says climate change is increasing the frequency, severity and duration of droughts, which contribute to food insecurity, poverty and inequality. … In 2018, Cape Town, South Africa, narrowly averted a “Day Zero,” when the taps would have run dry. Indian aquifers are falling fast. The Colorado River, a water source for 40 million people, faces dire shortages as the American West slides deeper into “megadrought.” By 2050, the world’s population is projected to near 10 billion, increasing water demand by 55%. And by then, two-thirds of people will live in cities.