Guardian: From his front door to the banks of the Cantareira reservoir, José Christiano da Silva used to stroll only a hundred metres when he first moved to the area in 2009. Today, amid the worst drought in So Paulo's history, he must now trek a kilometre across the dried-up bed before he reaches what's left of the most important water supply for South America's biggest city.
"It's frightening to look at," says the retiree, standing on cracked mud. "In the past, we'd already be under water here." After...