"The man pictured above is Raoni Txucarramãe, chief of the Kayapó people, who hail from Brazil's northern Pará province. The homeland of the Kayapó is the tropical rainforest surrounding the tributaries of the giant Xingu river, itself a nearly 2,000km long tributary of the Amazon. But the livelihood of the Kayapó people is under grave threat. Brazil's president, Dilma Vana Rousseff, has authorised the construction of a dam that will flood their homeland.

The Belo Monte dam will be the world's third-largest hydroelectric dam (after China's Three Gorges dam, itself with numerous problems, and the Brazilian-Paraguayan Itaipu dam). It will flood 400,000 hectares of the world's largest rainforest, displacing 20,000 to 40,000 people – including the Kayapó. The ecological impact of the project is massive: the Xingu River basin has four times more biodiversity than all of Europe. Flooding of the rainforest will liberate massive amounts of methane, a greenhouse gas far more damaging than carbon dioxide. But the impact on Chief Raoni's people, on an entire society, is unimaginable.

The Kayapó traditionally practised slash-and-burn agriculture on small farms cut into the jungle. The rich resources of their lands (minerals, timber, and potential hydroelectrical power) have brought pressures from outside. Although the Brazilian constitution explicitly prohibits the displacement of "Indians" from their traditional lands, it provides for one convenient exception: where the National Congress deems removal of the people to be "in the interest of the sovereignty of the country". Proponents of the dam argue that its construction is in the nation's interest."

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Jacqueline Windh: The Brazilian tribe that played by our rules, and lost (The Guardian 6/3)