Malthus has been buried many times, and Malthusian scarcity with him. But as Garrett Hardin remarked, anyone who has to be reburied so often cannot be entirely dead. – Herman E. Daly, Steady-State Economics, 1977

There is nothing in which the birds differ more from man than the way in which they can build and yet leave a landscape as it was before. – Robert Lynd, The Blue Lion and Other Essays

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

Every creature is better alive than dead, men and moose and pine trees, and he who understands it aright will rather preserve its life than destroy it. – Henry David Thoreau, "Chesuncook," The Maine Woods, 1848