I founded Friends of the Earth to make the Sierra Club look reasonable. Then I founded the Earth Island Institute to make Friends of the Earth seem reasonable.

Capitalism is a cancer in the biosphere.

Phasing out the human race will solve every problem on earth, social and environmental.

Our environmental problems originate in the hubris of imagining ourselves as the central nervous system or the brain of nature. We're not the brain, we are a cancer on nature.

There is no more honorable thing any of us can do with our lives than to work to put part of the world off-limits to the activities of human beings.

Free shackled rivers!...The finest fantasy of eco-warriors in the West is the destruction of [Glen Canyon] Dam and the liberation of the Colorado [River].

The human race could go extinct and I for one would not shed any tears.