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Men play pool in an area that will be flooded when the dam is completed near the site where the Belo Monte dam complex is under construction in the Amazon basin on June 14, 2012 in Altamira, Brazil. Belo Monte will be the world’s third-largest hydroelectric project and will displace up to 20,000 people while diverting the Xingu River and flooding as much as 230 square miles of rainforest. Thousands of Altamira residents will need to be relocated as up to one-third of the city will be underwater once the project is completed.

Men play pool in an area that will be flooded when the dam is completed near the site where the Belo Monte dam complex is under construction in the Amazon basin on June 14, 2012 in Altamira, Brazil. Belo Monte will be the world’s third-largest hydroelectric project and will displace up to 20,000 people while diverting the Xingu River and flooding as much as 230 square miles of rainforest. Thousands of Altamira residents will need to be relocated as up to one-third of the city will be underwater once the project is completed. Mario Tama/Getty Images

Brazil's Belo Monte Dam

Brazil's Belo Monte Dam will be the world’s third-largest hydroelectric Dam and will displace up to 20,000 and flooding as much as 230 square miles of rainforest. The controversial project is one of 60 projects Brazil has planned in the Amazon to generate electricity for its rapidly expanding economy.