The Carlsbad Desalination plant stands under construction in this aerial photograph taken over Carlsbad, California, U.S., on Monday, Aug. 31, 2015. The $1 billion Carlsbad plant, which uses reverse osmosis to purify seawater, will have the capacity to produce 54 million gallons a day of drinkable water. Photographer: Patrick T. Fallon/Bloomberg via Getty Images
