But stop it did—not everywhere, but at the borders of what appears from space to be a green island the size of a small country. The brown spreads around this protected zone in the southern Xingu river basin of Brazil, but doesn't penetrate.
These are the borders of the lands of indigenous tribes.
The Amazon rain forest is the greatest expression of life on Earth. It is home to about a third of our planet's terrestrial life forms, cycles about one-quarter of the Earth's freshwater, and plays a key role in absorbing carbon and moderating climate.