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View of floating debris carried by the tide and caught by the 'eco-barrier' before entering Guanabara Bay, at the mouth of Meriti river in Duque de Caxias, next to Rio de Janeiro, Brazil, on July 20, 2016. / AFP / YASUYOSHI CHIBA (Photo credit should read YASUYOSHI CHIBA/AFP/Getty Images)

View of floating debris carried by the tide and caught by the 'eco-barrier' before entering Guanabara Bay, at the mouth of Meriti river in Duque de Caxias, next to Rio de Janeiro, Brazil, on July 20, 2016.  / AFP / YASUYOSHI CHIBA        (Photo credit should read YASUYOSHI CHIBA/AFP/Getty Images)