Key quotation, referring to restoration in Santa Clara Canyon, NM:
The pueblo's recreation director, Stanley Tafoya, says simply "What we are trying to do is restore our resources. The older people want their grandkids to enjoy the canyon we once knew."
That said, there is no Eden to restore. The North American landscape encountered by Europeans invaders was hardly a pristine wilderness. Early human hunters may have helped wipe out mammoths and other megafauna at the end of the Ice Age. For thousands of years after that, Native Americans manipulated the land for their own needs with dams, canals, and fields. They regularly cut and burned the forests to clear land for farming and hunting.