Brazil Rio+20

  Environmental activists chant slogans while blocking a corridor inside the venue hosting the United Nations Conference on Sustainable Development, or Rio+20, in Rio de Janeiro, Brazil, Thursday, June 21, 2012. (AP Photo/Victor R. Caivano)
Environmental activists chant slogans while blocking a corridor inside the venue hosting the United Nations Conference on Sustainable Development, or Rio+20, in Rio de Janeiro, Brazil, Thursday, June 21, 2012. (AP Photo/Victor R. Caivano)

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