Rio de Janeiro, January 20th 2014. A recurrent problem in the summer of 2014, a long sea foam appears on Rio's coast, here showing the sea by Arpoador, Ipanema and Leblon beaches. Authorities claim it is a harmless algae proliferation caused by heat, but experts argue that the phenomenon, although natural, is intensified the presence of sewage. Rio de Janeiro, Brazil. Credit: Maria Adelaide Silva/Alamy Live News

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Photo credit: © Maria Adelaide Silva / Alamy / Afripics
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