I'm absolutely strict about it. When I land, I put my watch right, and I don't care what I feel like, I will go to bed at half past eleven. If that means going to bed early or late, that's what I live by. As soon as you get there, live by that time.

Many individuals are doing what they can. But real success can only come if there is a change in our societies and in our economics and in our politics.

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

People are not going to care about animal conservation unless they think that animals are worthwhile.

Terrorism is an immediate problem that people are very concerned about, and I am as concerned about that as anyone else. But it isn't an either or situation.

It's coming home to roost over the next 50 years or so. It's not just climate change; it's sheer space, places to grow food for this enormous horde. Either we limit our population growth or the natural world will do it for us, and the natural world is doing it for us right now.

All the modern devices we have enable us to investigate things and have enabled us to do better.