The system of nature, of which man is a part, tends to be self-balancing, self-adjusting, self-cleansing. Not so with technology. – E.F. Schumacher, Small is Beautiful, 1973

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

We abuse land because we regard it as a commodity belonging to us. When we see land as a community to which we belong, we may begin to use it with love and respect. – Aldo Leopold, A Sand County Almanac

Nature provides a free lunch, but only if we control our appetites. – William Ruckelshaus, Business Week, 18 June 1990