Brazil's President Dilma Rousseff, right, and United Nations Secretary General Ban Ki-Moon hold the gavel together as they close the Rio+20 UN Conference on Sustainable Development in Rio de Janeiro, Brazil, Friday, June 22, 2012. (AP Photo/Andre Penner)

Associated Press
Brazil's President Dilma Rousseff, right, and United Nations Secretary General Ban Ki-Moon hold the gavel together as they close the Rio+20 UN Conference on Sustainable Development in Rio de Janeiro, Brazil, Friday, June 22, 2012. (AP Photo/Andre Penner)
Brazil's President Dilma Rousseff, right, and United Nations Secretary General Ban Ki-Moon hold the gavel together as they close the Rio+20 UN Conference on Sustainable Development in Rio de Janeiro, Brazil, Friday, June 22, 2012. (AP Photo/Andre Penner)
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