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.

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.

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

I have no doubt that the fundamental problem the planet faces is the enormous increase in the human population

The notion of ever more old people needing ever more young people, who will in turn grow old and need even more young people, and so on ad infinitum, is an obvious ecological Ponzi scheme.

I think a major element of jetlag is psychological. Nobody ever tells me what time it is at home.