More problems for Rio as oil turns white boats to brown at Olympic
Don't put your head underwater': visitors warned over Olympics pollution, Rio 2016
Rio Olympics pollution problem worsens as raw sewage pours into Guanabara Bay
Rio garbage boats aim to clean Olympic waters
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More problems for Rio as oil turns white boats to brown at Olympic sailing venue – New York Daily News
Can Rio clean its polluted Olympic waters in time for games?
IOC: Brazil's political turmoil will 'inevitably' affect Rio 2016 Olympics, Rio 2016
