If we were all to reduce our demands for energy, it would make an enormous amount of difference.

They always mean beautiful things like hummingbirds. I always reply by saying that I think of a little child in east Africa with a worm burrowing through his eyeball. The worm cannot live in any other way, except by burrowing through eyeballs. I find that hard to reconcile with the notion of a divine and benevolent creator.

Nature isn't positive in that way. It doesn't aim itself at you. It's not being unkind to you.

I'm against this huge globalisation on the basis of economic advantage.

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.

We can now manipulate images to such an extrodinary extent that there's no lie you cannot tell.

One in eight plant species face extinction.