By Matthew Knight
Narrated by the actress Sigourney Weaver, the video explains how the dam--scheduled to be built on the Xingu River, a tributary of the Amazon River--will flood 500 square kilometers of agricultural land and rainforest, displacing over 20,000 people who have lived there for generations.
Cameron's help on the project has been invaluable, Amazon Watch's program director, Leila Salazar-Lopez told CNN. The Oscar-winning director helped enlist the services of Weaver and Google Earth.
For more on the subject, see Okay to Meddle in Brazil? and Dam Suspended with Cameron's Help.