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In this photo taken Sept. 14, 2009, Wilder Condeza, 12, plays with his father's sheep in the Quiulacocha village on the outskirts of the mining town of Cerro de Pasco in Peru. Wilder has elevated levels of lead in his blood, which has slowed his physical and mental development, according to his father. Peru's congress passed a bill in 2008 to condemn and relocate Cerro de Pasco, based on U.S. Centers for Disease Control studies that found soil, homes and water saturated with toxic levels of lead. Nine of 10 children have elevated blood levels of one of 14 heavy metals, including lead, cadmium, and arsenic, according to the CDC. (AP Photo/Martin Mejia)