Man has only to sink beneath the surface and he is free.

There is about as much educational benefit to be gained in studying dolphins in captivity as there would be studying mankind by only observing prisoners held in solitary confinement.

The reason I love the sea I cannot explain - it's physical. When you dive you begin to feel like an angel. It's a liberation of your weight.

In order to save the planet it would be necessary to kill 350,000 people per day.

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

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.

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.