THE WATER thieves come at night. They arrive in trucks, suck water out of irrigation canals and drive off. This infuriates Alejandro Meneses, who owns a big vegetable farm in Coquimbo, a parched province of Chile. In theory, his landholding comes with the right to pour 40 litres of river-water a second on his fields. But thanks to drought, exacerbated by theft, he can get just a tenth of that, which he must negotiate with his neighbours. If the price of food goes up because farmers like him cannot grow enough, “there will be a big social problem,” he says.