Till now man has been up against Nature; from now on he will be up against his own nature. – Dennis Gabor, Inventing the Future, 1964
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