All I know about thermal pollution is that if we continue our present rate of growth in electrical energy consumption it will simply take, by the year 2000, all our freshwater streams to cool the generators and reactors.

Overpopulation is perhaps the biggest problem facing us, and immigration is part of that problem. It has to be addressed.

To me, a wilderness is where the flow of wildness is essentially uninterrupted by technology; without wilderness the world is a cage.

Without wilderness, the world's a cage.

The risk presented by these lethal wastes is like no other risk, and we should not be expected to accept it or to project it into the future in order for manufacturers and utilities to make a dollar killing now.

Even if you build the perfect reactor, you're still saddled with a people problem and an equipment problem.

For how many people do you think might yet stand on this planet before the sun grows cold? That's the responsibility we hold in our hands.