green light. two years ago, the country's power grid failed because it was overloaded. the economy is growing fast, and brazil needs more electricity. >> the average for dams in brazil is half a square kilometers of land flooded per megawatt capacity. in belo monte, the ratio is much better, just 1/10 of that. it is unique. it will destroy a lot less land. >> the group fighting to stop the project says the arguments of norte energia are nonsense. it says 668 square kilometers of land will be flooded and much of the river diverted. that 80% of the xingu will be rerouted through this area and rejoin its original course here. that will cause permanent drought along the rivers big bend in the area marked in red -- great. the fish and turtles account for 3/4 of the local populations diet. the indigenous people live off fish and the resources of the forest -- resources that will disappear. >> renata pinheiro, a biologist, companies us on a trip through the pristine juggle an river landscape. she says huge amounts of greenhouse gas will be released when the forest is submerged, which will further fuel climate change. 12 indigenous tribes, including the arara, liv