Not far from Latin America's biggest city, Sao Paulo, a #river is covered in a white layer that resembles fresh snow but is in fact a smelly, toxic foam. But parts of the #waterway, including one area just 100 kilometers (62 miles) from the metropolis, have been befouled by phosphate and phosphorus residues from household detergents used by Sao Paulo's 22 million inhabitants and washed down the #sewers. #wastewater #pollution https://news.yahoo.com/toxic-foam-blights-river-crucial-002055671.html