An Indian youth swims in the polluted Yamuna river amid rising temperatures in New Delhi on May 9, 2017. According to the Central Pollution Control Board (CPCB) which monitors the water quality of the Yamuna in New Delhi, 70% of the pollution of the river is from untreated sewage while the remainder is from industrial sources, agricultural run-off, and domestic garbage. (Photo by Prakash Singh/AFP Photo)
