Indigenous people living in the Amazon rainforest fear their survival is being threatened, as more and more trees are cut down to make way for farming and agriculture.

They say Brazil's new president wants to allow deforestation in some of the 700 protected areas for indigenous groups within the Brazilian rainforest - which cover more than a tenth of Brazil's entire land area.

Around 900,000 indigenous people live there - but that's a tiny proportion of Brazil's overall population.

The BBC's Science editor David Shukman has been to see one group fearing for its future. Watch his report and comment on the text below from Amnesty International:

In every region of the world, Indigenous peoples are consistently among the most marginalised and frequently victimised members of society. Although there is enormous diversity in the cultures and histories of these peoples, there are commonalities in the human rights violations that they have experienced.

Indigenous peoples’ rights to their own lands and territories have been arbitrarily ignored, resulting in devastating historic dispossession and ongoing failure to restore lands or protect Indigenous peoples’ remaining territories. Racism toward Indigenous peoples fuels violence in society and ill-treatment at the hands of authorities. Government services that are meant to be accessible to all are too often denied for Indigenous communities.

Indigenous peoples to be full and effective participants in all decisions affecting their lives and futures. Around the world, Indigenous peoples have experienced terrible consequences as a result of decisions made without their involvement. International human rights standards recognize that the contemporary situation of marginalisation and impoverishment of many Indigenous peoples requires especially rigorous protection of their rights. A crucial part of that protection is the direct involvement of Indigenous peoples in decision-making.

Is it the responsibility of governments to consult Indigenous peoples about their lives and futures?

Indigenous peoples have sought recognition of their identities, way of life and their right to traditional lands, territories and natural resources for years, yet throughout history, their rights have always been violated. Indigenous peoples today, are arguably among the most disadvantaged and vulnerable groups of people in the world. How can or should governments redress this? Visit the UN Department of Economic and Social Affairs here.

Should people have the right to defend their culture and way of life?

Read the attached article from New Internationalist on Brazil's indigenous people.