7 of 20: Indigenous from several tribes participate in the Sacred Fire Lighting Ceremony at the Kari-Oca village, during the United Nations Conference on Sustainable Development, or Rio+20, in Rio de Janeiro, Brazil, Wednesday, June 13, 2012. The United Nations' largest-ever conference has kicked off in Rio de Janeiro. The event runs through June 22, with three final days of high-profile talks among some 130 top leaders from nations around the globe. (AP Photo/Felipe Dana) (AP Photo/ Felipe Dana)

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