When your pockets are as deep as Chevron's, you can afford to wait out most anything. Delay court proceedings long enough, and eventually the people suing you will die off. Especially if you've made them sick with cancer.
Here's a story about one such person:
Mother of Three Dies of Cancer
* Correction: I've just been informed that the actual number of surviving Sacha Sur is 200, not 300.
Just to put those numbers in perspective, if we were talking about an animal species rather than a human tribe, this is the category that the Sacha Sur would be placed in:
"Critically Endangered is the highest risk category assigned by the IUCN Red List for wild species. Critically endangered means that a species' numbers have decreased, or will decrease, by 80% within three generations."
The only category between this one and Extinction is "Extinct in the Wild."