In this July 31, 2017 photo Biologist Mario Moscatelli speaks during an interview with the AP on the shores of Guanabara bay, in Rio de Janeiro, Brazil. Rio pledged in its Olympic bid to treat 80 percent of its water waste before the start of the Games, but it failed to deliver on that promise. A study commissioned by The Associated Press showed dangerously high levels of contamination. (AP Photo/Silvia Izquierdo)
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