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.

One in eight plant species face extinction.

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

I don't think we are going to become extinct. We're very clever and extremely resourceful - and we will find ways of preserving ourselves, of that I'm sure. But whether our lives will be as rich as they are now is another question.

I would be absolutely astounded if population growth and industrialisation and all the stuff we are pumping into the atmosphere hadn't changed the climatic balance. Of course it has. There is no valid argument for denial.

The more you go on, the less you need people standing between you and the animal and the camera waving their arms about.

Television of course actually started in Britain in 1936, and it was a monopoly, and there was only one broadcaster and it operated on a license which is not the same as a government grant.