Aotus lemurinus, a type of owl monkey also referred to as the gray-bellied night monkey, seen here at the Santa Fe Zoo, in Medellin, Colombia. Raul Arboleda/AFP/Getty Images hide caption

itoggle caption Raul Arboleda/AFP/Getty Images

A truck carrying hardwood timber drives along a rural road leading to Paragominas, Brazil, on Sept. 23, 2011. The city has become a pioneering "Green City," a model of sustainability with a new economic approach that has seen illegal deforestation virtually halted. Andre Penner/AP hide caption

itoggle caption Andre Penner/AP