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Small boats sit on the shore of Guanabara Bay near the suburb of Sao Goncalo, across the bay from Rio de Janeiro, Brazil, Monday, March 23, 2015. Authorities promised in Rio's winning bid to drastically clean up the pollution in Guanabara bay, cutting it by 80 percent. But with 500 days left before the games, experts say efforts have had little impact on the garbage and sewage pollution of the waters where sailing, swimming and other aquatic events will take place. (Photo by Felipe Dana/AP Photo)
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