I'm not an animal lover if that means you think things are nice if you can pat them, but I am intoxicated by animals.

We can now destroy or we can cherish-the choice is ours.

There are perfectly good independent small nations.

You know, it is a terrible thing to appear on television, because people think that you actually know what you're talking about.

[W]hen we look at the graphs of rising ocean temperatures, rising carbon dioxide in the atmosphere and so on, we know that they are climbing far more steeply than can be accounted for by the natural oscillation of the weather ... What people (must) do is to change their behavior and their attitudes ... If we do care about our grandchildren then we have to do something, and we have to demand that our governments do something.

If I were beginning my career today, I don't think I would take the same direction. Television is at a crossroads at the moment. And although I am not up to date technologically, I suspect that somewhere out there people are conveying things about natural history by means other than television, and I think if I were beginning today, I'd be there.

How could I look my grandchildren in the eye and say I knew what was happening to the world and did nothing.