‎Using his burgeoning intelligence, this most successful of all mammals has exploited the environment to produce food for an ever increasing population. Instead of controlling the environment for the benefit of the population, perhaps it's time we controlled the population to allow the survival of the environment.

I'm no longer sceptical. I no longer have any doubt at all. I think climate change is the major challenge facing the world.

You have to steer a course between not appalling people, but at the same time not misleading them.

The World is full of wonders, but they become more Wonderful, not less Wonderful when Science looks at them.

It seems to me that the natural world is the greatest source of excitement; the greatest source of visual beauty; the greatest source of intellectual interest. It is the greatest source of so much in life that makes life worth living.

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 don't approve of sunbathing, and it's bad for you.