FILE - In this June 5, 2010 file photo, the Tiete River runs through Sao Paulo, Brazil. The main river running through South America’s biggest city has a “dead” stretch that’s doubled in the past year to over 96 miles (155 kilometers) because of sewage pollution, according to a report released late Sept. 2015 by environmental group SOS Mata Atlantica. (AP Photo/Nelson Antoine, File)