GUANABARA BAY, BRAZIL Floating debris carried by the tide are caught by the "eco-barrier" before entering Guanabara Bay, at the mouth of Meriti River in Duque de Caxias, next to Rio de Janeiro. The Bay drew global attention in the run-up to the 2016 Olympic Games, when concerns about athletes’ health resulting from polluted waters cropped up.
As Rio fails to keep its promise to clean up raw sewage & garbage from rivers & bay for the Olympics, contestants order virus testing of waters. "..the scale of the filth is staggering; the stench overwhelming.." http://www.cbc.ca/news/world/rio-olympics-sewage-1.3704804 - Despite an uncaring population, new to Rio is a small caring group, 'Guardians of the River.' http://www.cbc.ca/news/world/guardians-of-the-river-make-tiny-dent-in-rio-s-unrelenting-pollution-1.3714213