Rio de Janeiro's Sub Secretary of Environment Carlos Portinho, left, inspects the water in front of an "eco-boat" in Guanabara Bay in Rio de Janeiro, Brazil, Thursday, April 10, 2014. The barge is one of three so-called "eco-boats," floating garbage vessels that are a key part of authorities' pledge to clean up Rio’s devastated Guanabara Bay before the city – and the waterway itself – plays host to the 2016 Olympic games. (AP Photo/Silvia Izquierdo)

Associated Press
Rio de Janeiro's Sub Secretary of Environment Carlos Portinho, left, inspects the water in front of an "eco-boat" in Guanabara Bay in Rio de Janeiro, Brazil, Thursday, April 10, 2014. The barge is one of three so-called "eco-boats," floating garbage vessels that are a key part of authorities' pledge to clean up Rio’s devastated Guanabara Bay before the city – and the waterway itself – plays host to the 2016 Olympic games. (AP Photo/Silvia Izquierdo)
Rio de Janeiro's Sub Secretary of Environment Carlos Portinho, left, inspects the water in front of an "eco-boat" in Guanabara Bay in Rio de Janeiro, Brazil, Thursday, April 10, 2014. The barge is one of three so-called "eco-boats," floating garbage vessels that are a key part of authorities' pledge to clean up Rio’s devastated Guanabara Bay before the city – and the waterway itself – plays host to the 2016 Olympic games. (AP Photo/Silvia Izquierdo)
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