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Associated Press
A teenager jumps into the Jacare river, one of the most polluted rivers in the country, to show the media how they usually take a swim there at Manguinhos slum in Rio de Janeiro, Brazil, Monday, June 18, 2012. The non-governmental organization "Rio de Paz" or "River of Peace" organized a media tour to Manguinhos slum, one of the most polluted, poor and violent slums, while the city hosts the Rio+20 United Nations Conference on Sustainable Development that runs through June 22.  (AP Photo/Victor R. Caivano)

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