An abandoned shoe is seen on Botafogo beach in the polluted Guanabara Bay in Rio de Janeiro, Brazil, on March 10, 2015. The Olympic 2016 sailing competitions will be hosted in the Guanabara Bay. Water pollution in this area has become a hot-button issue for Rio. (Xinhua/Xu Zijian)
An abandoned shoe is seen on Botafogo beach in the polluted Guanabara Bay in Rio de Janeiro, Brazil, on March 10, 2015. The Olympic 2016 sailing competitions will be hosted in the Guanabara Bay. Water pollution in this area has become a hot-button issue for Rio. (Xinhua/Xu Zijian)A woman walks on Botafogo beach in the polluted Guanabara Bay in Rio de Janeiro, Brazil, on March 10, 2015. The Olympic 2016 sailing competitions will be hosted in the Guanabara Bay. Water pollution in this area has become a hot-button issue for Rio. (Xinhua/Xu Zijian)Rubbish is seen on Botafogo beach in the polluted Guanabara Bay in Rio de Janeiro, Brazil, on March 10, 2015. The Olympic 2016 sailing competitions will be hosted in the Guanabara Bay. Water pollution in this area has become a hot-button issue for Rio. (Xinhua/Xu Zijian)A cleaner works on Botafogo beach in the polluted Guanabara Bay in Rio de Janeiro, Brazil, on March 10, 2015. The Olympic 2016 sailing competitions will be hosted in the Guanabara Bay. Water pollution in this area has become a hot-button issue for Rio. (Xinhua/Xu Zijian)