Andre Penner, Associated Press
An indigenous boy attends a protest against the construction of a dam in Altamira, Brazil, on Thursday. The proposed hydroelectric Belo Monte dam, to be built in the Xingu River, would be the world's third largest for power production, but many are worried that it could kill the Indians' fish, displace 15,000 people and help ruin the rain forest.

An indigenous boy attends a protest against the construction of a dam in Altamira, Brazil, on Thursday. The proposed hydroelectric Belo Monte dam, to be built in the Xingu River, would be the world's third largest for power production, but many are worried that it could kill the Indians' fish, displace 15,000 people and help ruin the rain forest.