It has begun: Belo Monte Dam

[auroraglacialis]

They have begun to build it. Protests, petitions and legal attempts have failed.
Brazil begins preliminary damming of Xingu River as protests continue

Damming of the Xingu River has begun in Brazil to make way for the eventual construction of the hugely controversial, Belo Monte dam. The Norte Energia (NESA) consortium has begun building coffer dams across the Xingu, which will dry out parts of the river before permanent damming, reports the NGO International Rivers. Indigenous tribes, who have long opposed the dam plans on their ancestral river, conducted a peaceful protest that interrupted construction for a couple hours.
[...]
Indigenous tribes say they were not notified that Norte Energia (NESA) had begun constructing coffer dams until the river became red-colored with mud.
"When we learned what they were doing, it practically killed us with sadness," Josinei Arara, a member of the Arara indigenous community 10 miles downstream on the Xingu from the Pimental dam site, told International Rivers. "The dam builders have kept none of their promises to compensate our village; in they meantime, they’re assassinating our river."
[...]
Last November, a Brazilian court ruled that indigenous communities do not have a right to free, prior and informed consultation regarding the Belo Monte dam because it is physically located on tribal lands.