I sort of kept my hand in writing and went to work for the Sierra Club in '52, walked the plank there in '69, founded Friends of the Earth and the League of Conservation Voters after that.

The wild places are where we began. When they end, so do we.

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

There are many ways to salvation, and one of them is to follow a river.

If something's going wrong with this planet we'd better fix it here and not look for some sort of escape.

Childbearing should be a punishable crime against society, unless the parents hold a government license. All potential parents should be required to use contraceptive chemicals, the government issuing antidotes to citizens chosen for childbearing.

If I could go back to a point in history to try to get things to come out differently, I would go back and tell moses to go up the mountain again and get the other tablet. Because the Ten Commandments just tell us what we are supped to do with one another, not a word about our relationship to the earth. Genesis starts with these commands: multiply, replenish the earth, and subdue it. We have multiplied very well, we have replenished our populations very well, we have subdued it all too well, and we don't have any other instruction.