The reality is that if we do not put a stop to this destruction of the natural world it will put a stop to us. It is not "human nature" that is the cause of this, bad people as opposed to good people. Capitalism demands this process, the land is commodified, everything has as price and must produce not a social need, but surplus value; it must be made a profitable enterprise.
Unless the workers and oppressed people's of the world act decisively, it won't just be the indigenous of Brazil that lose their way of life and their existence as a people, it will be the entire human race. We are not there yet, there is still time to reverse the destruction that capitalism is wreaking on the Earth and on human beings, but time is getting short, it won't go away by itself.