RIO DE JANEIRO, BRAZIL - Just 30 kilometers from Itaim Bibi, the financial heart and posh district of São Paulo, is the most polluted river in Brazil. The Tietê's water is gray. The fish do not survive. The smell is unbearable.
However, this is the water that can be seen from the kitchen window of Adriana Santos, 29, her husband and her three children, and that is used for bathing . . .