I wake up saying, I'm still alive; a miracle. And so I keep on pushing.

It is fashionable nowadays to talk about the endless riches of the sea. The ocean is regarded as a sort of bargain basement, but I don't agree with that estimate. People don't realize that water in the liquid state is very rare in the universe. Away from earth it is usually a gas. This moisture is a blessed treasure, and it is our basic duty, if we don't want to commit suicide, to preserve it.

When we return wild animals to nature, we merely return them to what is already theirs. For man cannot give wild animals freedom, they can only take it away.

Mankind has probably done more damage to the Earth in the 20th century than in all of previous human history.

In order to stabilize world population, we must eliminate 350,000 per day.

For most of history, man has had to fight nature to survive; in this century he is beginning to realize that, in order to survive, he must protect it.

I believe that national sovereignties will shrink in the face of universal interdependence.