A dam which supplies water to 45 percent of Sao Paulo. (Getty Images)ATIBAIA, Brazil — Seen from a micro-light aircraft, flying low near this small town in Brazil’s interior, the scale of the water crisis blighting São Paulo, a megalopolis 40 miles away, was frighteningly clear. Four of the five reservoirs in an interlinked system that supplies 6.5 million people, more than a third of its metropolitan population, were vividly depleted. Caked red banks of exposed earth showed just how low the water levels had fallen. Story here.