Untreated sewage and viruses in Guanabara Bay have led UN to advise athletes to spend as little time in the water as possible

There can be few more beautiful city sights in the world than that from the Marina da Gloria, where the Rio 2016 Olympic sailing events will be launched this weekend.

Look out from the quayside across Guanabara Bay and the panorama takes in Sugarloaf mountain, the Niteroi bridge and the distant hills of the Serra dos Org√£os national park, while behind you are the palm trees of Flamengo Park and the state of Christ the Redeemer.

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Source: Guardian Environment