Douira, Morocco - The drought has held its grip for seven years and counting. Scorched vegetation crinkles underfoot. The color has drained almost entirely from Morocco’s agricultural heartland, with one exception: inside vast mesh-covered agricultural enclosures, where lush tomatoes grow on vines, destined for supermarkets in Europe.

These man-made oases are being sustained not by rainfall but by seawater - filtered of salt and piped in from a plant on the coast.

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