Pollution from cities and agricultural areas have led some to label the Río de la Plata and its small tributaries Argentina’s “worst environmental stain.”14 It is common to see trash and sewage floating in the river. Even though the Supreme Court of Argentina called for an official plan to clean up the river basin in 2008, little has been done. For example, in 2008 there were 141 open trash dumps with industrial, chemical and household waste along the Matanza tributary, which runs from western Buenos Aires into the Rio de la Plata.