Gallery: Water quality issues in Rio

In this July 5, 2016 photo, cars drive above sewage flowing from the suburb of Sao Goncalo into Guanabara Bay, across the bay from Rio de Janeiro, Brazil. Throughout Brazil, sewage treatment has lagged dramatically, meaning that so-called 'black tongues' of fetid, sewage-filled water are common on beaches across the country. (AP Photo/Felipe Dana) provides commenting to allow for constructive discussion on the stories we cover. In order to comment here, you acknowledge you have read and agreed to our Terms of Service. Commenters who violate these terms, including use of vulgar language or racial slurs, will be banned. Please be respectful of the opinions of others and keep the conversation on topic and civil. If you see an inappropriate comment, please flag it for our moderators to review.

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