stream

An Afghan refugee girl washes a bed in a polluted stream, in a poor neighborhood on the outskirts of Islamabad, Pakistan, Tuesday, Sept. 30, 2014.

Muhammed Muheisen/AP

An Afghan refugee girl washes a bed in a polluted stream, in a poor neighborhood on the outskirts of Islamabad, Pakistan

Kindergartners drink waters near a poster to mark the World Water Day, which falls on March 22, on Cheonggye Stream in Seoul, South Korea, Thursday, March 20, 2014.

Ahn Young-joon/AP

Kindergartners drink waters near a poster to mark the World Water Day, which falls on March 22, on Cheonggye Stream in Seoul, South Korea.