We are the most dangerous species of life on the planet, and every other species, even the earth itself, has cause to fear our power to exterminate. But we are also the only species which, when it chooses to do so, will go to great effort to save what it might destroy.
We simply need that wild country available to us... For it can be a means of reassuring ourselves of our sanity as creatures, a part of the geography of hope.
Something will have gone out of us as a people if we ever let the remaining wilderness be destroyed ... so that never again can we have the chance to see ourselves single, separate, vertical and individual in the world, part of the environment of trees and rocks and soil, part of the natural world and competent to belong in it.
We are the only species which, when it chooses to do so, will go to great effort to save what it might destroy.