Pollution In Rio's Guanabara Bay A Challenge For 2016 Olympics

NITEROI, BRAZIL - JULY 30: A man walks along the shoreline of the polluted waters of Guanabara Bay near Rio de Janeiro on July 30, 2014 in Niteroi, Brazil. The iconic bay will be the site of sailing events during the Rio 2016 Olympic Games. Although Rio's Olympic bid included the promise to clean up the filthy bay, industrial and human pollution still remain a major problem. According to the Deputy State Secretary of Environment just 34% of Rio's sewage is treated while the remainder flows untreated into the waters. (Photo by Buda Mendes/Getty Images)