It seems to me that the natural world is the greatest source of excitement; the greatest source of visual beauty; the greatest source of intellectual interest. It is the greatest source of so much in life that makes life worth living.

It is that range of biodiversity that we must care for - the whole thing - rather than just one or two stars.

The only way to save a rhinoceros is to save the environment in which it lives, because there's a mutual dependency between it and millions of other species of both animals and plants.

I just wish the world was twice as big and half of it was still unexplored.

People must feel that the natural world is important and valuable and beautiful and wonderful and an amazement and a pleasure.

The question is, are we happy to suppose that our grandchildren may never be able to see an elephant except in a picture book?

I don't run a car, have never run a car. I could say that this is because I have this extremely tender environmentalist conscience, but the fact is I hate driving.

If I can bicycle, I bicycle.

An understanding of the natural world and what's in it is a source of not only a great curiosity but great fulfillment.