A Yemeni boy stands in the middle of garbage at a slum area on the outskirts of Sanaa, Yemen, Monday, April 22, 2013. Hundreds of countries globally, mark International Earth Day on April 22, to help raise ecological awareness and support environmental protection. (AP Photo/Hani Mohammed)

Associated Press
A Yemeni boy stands in the middle of garbage at a slum area on the outskirts of Sanaa, Yemen, Monday, April 22, 2013. Hundreds of countries globally, mark International Earth Day on April 22, to help raise ecological awareness and support environmental protection. (AP Photo/Hani Mohammed)
A Yemeni boy stands in the middle of garbage at a slum area on the outskirts of Sanaa, Yemen, Monday, April 22, 2013. Hundreds of countries globally, mark International Earth Day on April 22, to help raise ecological awareness and support environmental protection. (AP Photo/Hani Mohammed)
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