Environmental activists, one portraying Brazilian President Dilma Rousseff holding a banner symbolizing "dirty money" made from fossil fuel subsidies, protest on the final day of the United Nations Conference on Sustainable Development, or Rio+20, in Rio de Janeiro, Brazil, Friday, June 22, 2012. (AP Photo/Andre Penner)

Photo by: Andre Penner

Environmental activists, one portraying Brazilian President Dilma Rousseff holding a banner symbolizing "dirty money" made from fossil fuel subsidies, protest on the final day of the United Nations Conference on Sustainable Development, or Rio+20, in Rio de Janeiro, Brazil, Friday, June 22, 2012. (AP Photo/Andre Penner)