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Rio+20 Low on Concrete Outcomes. Photo: Indigenous groups from all over the world participated in the 2012 United Nations Conference on Sustainable Development, Rio+20, in Rio de Janeiro, Brazil. (Christophe Simon/AFP/GettyImages)

Human Rights in Russia, Worst Since Soviet Era, Says Rights Group. Russian police arrest an unauthorized activist during a protest marking one year since the start of protests against Vladimir Putin, in Moscow, on Dec. 15, 2012. Human Rights Watch says the rights situation in Russia today is the worst since the communist era. (Natalia Kolesnikova/Getty Images)

Hopi Indian dancer, 2 year old Ronald Timeche performs the eagle dance at the Hopi House on the South Rim of Grand Canyon National Park, Circa 1950. NPS/ Santa Fe RR photo. Grand Canyon National Park Museum Collection, P.O. Box 129, Grand Canyon, AZ 86023

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South Korean new officers salute during the joint commission ceremony of 5,780 new officers in Gyeryong, South Korea on March 8. New and ongoing military drills with South Korean and U.S troops have sparked threats from North Korea. (Kim Jae-Hwan/AFP/Getty Images)