To waste, to destroy our natural resources, to skin and exhaust the land instead of using it so as to increase its usefulness, will result in undermining in the days of our children the very prosperity which we ought by right to hand down to them amplified and developed. – Theodore Roosevelt, seventh annual message, 3 December 1907

The earth we abuse and the living things we kill will, in the end, take their revenge; for in exploiting their presence we are diminishing our future. – Marya Mannes, More in Anger, 1958

We are shaped by each other. We adjust not to the reality of a world, but to the reality of other thinkers. – Joseph Chilton Pearce