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.

It is certain that the study of human psychology, if it were undertaken exclusively in prisons, would also lead to misrepresentation and absurd generalizations.

If we go on the way we have, the fault is our greed and if we are not willing to change, we will disappear from the face of the globe, to be replaced by the insect.

I am absolutely enraptured by the atmosphere of a wreck. A dead ship is the house of a tremendous amount of life-fish and plants. The mixture of life and death is mysterious, even religious. There is the same sense of peace and mood that you feel on entering a cathedral.

There are no boundaries in the real Planet Earth. No United States, no Soviet Union, no China, no Taiwan...Rivers flow unimpeded across the swaths of continents. The persistent tides - the pulse of the sea - do not discriminate; they push against all the varied shores on Earth.

We have to prepare for what life could become in 40 years. We need to outline what is possible and what is impossible with the non-renewable resources of the Earth. What role will technological improvement play? Taking all this into account, what kind of life can we produce in the best way for 10 billion people? That's a problem that needs to be solved.

If human civilization is going to invade the waters of the earth, then let it be first of all to carry a message of respect.