In this Feb. 1, 2017 photo, children ride bikes along the Torococha River near a municipal waste treatment plant with water that flows into Lake Titicaca, in Juliaca, in the Puno region of Peru. Many of the more than 400,000 tourists who visit Lake Titicaca from Peru each year stop first in Juliaca, a town that produces 200 tons of trash daily, much of it winding up in a river that has turned into a conveyor belt of waste heading into the lake. (AP Photo/Rodrigo Abd)
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