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In this July 31, 2017 photo, a trash barrier hold back the surface filth of the heavily polluted Jacarepagua lagoon, 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. (AP Photo/Silvia Izquierdo)

In this July 31, 2017 photo, a trash barrier hold back the surface filth of the heavily polluted Jacarepagua lagoon, 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. (AP Photo/Silvia Izquierdo)

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