Began with Thoreau as a concept, and has become a central tenet for modern environmentalists who see human growth as inevitable. Yellowstone, Redwoods, etc. Began with Thoreau, was taken strongly by John Muir, whose philosophy shapes much of modern environmentalist thinking. How you view nature and your place in it will directly affect how you behave environmentally. All materials must cycle We are running an unsustainable world, from unsustainable population increases to unsustainable resource usage and wasting.
Humans have a long history of both adaptive successes and adaptive failures.