In this part of the Amazon rain forest, they call it "the war over wood."
It has front lines.
One of them is here, in Machadinho d'Oeste in the western Brazilian state of Rondonia.
The self-described "Guardians of the Forest" defending the land don't look like fighters, at least when we first meet them. But they are pitting themselves against criminal logging gangs that have infiltrated their protected reserves.