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.

It was regarded as a responsibility of the BBC to provide programs which have a broad spectrum of interest, and if there was a hole in that spectrum, then the BBC would fill it.

Human beings, because we're so clever, have removed every single one of those population limiting factors... So nothing controls our increase in numbers except our own wish. Since I first started making television programs, the population of the world has increased three times. That's an extraordinary notion. Can it increase four times? Can it increase five times? The Earth is a finite size. So a point will eventually come when we run out of food, when we run out of space and when we will have destroyed most of the natural world. So ought we to do something about it before that happens?

I often get letters, quite frequently, from people who say how they like the programmes a lot, but I never give credit to the almighty power that created nature.

The reverse side of the coin in having this extraordinary ability to go anywhere, is that no one anywhere is remote any more.

I believe the Abominable Snowman may be real. I think there may be something in that.

There are perfectly good independent small nations.