Mongolian sheep and cattle graze at grasslands at the Hustai National Park in Mongolia on June 5. (Mark Ralston/AFP/Getty Images)

Mongolian sheep and cattle graze at grasslands on World Environment Day at the Hustai National Park in Mongolia on June 5, 2013. The World Environment Day celebration began in 1972 by the United Nations and is used to raise worldwide awareness of the environment and encourage political attention and action. MARK RALSTON/AFP/Getty Images


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