Residents drag a dinghy across the drying bottom of the Paraibuna dam, part of the Cantareira water system that provides greater Sao Paulo with most of its water, in Redencao da Serra on August 11. The Paraibuna river is at its lowest level in more than a decade, putting at risk plans by the Sao Paulo state water authorities to pump water from there to offset the effects of a record drought and increasing the likelihood of water rationing in the near future in South America's largest city, according to local media.  Reuters/Roosevelt Cassio