I find it far more awesome, wonderful, that creation; our appearance in the world; should be the culmination, or at least one of the latest products of 3,000 Million years of organic evolution, than a kind of country trick, taking a rib out of a man's side in a trance.

One in eight plant species face extinction.

Clearly we could devastate the world... as far as we know, the Earth is the only place in the universe where there is life. Its continued survival now rests in our hands

Instead of controlling the environment for the benefit of the population, perhaps we should control the population to ensure the survival of our environment

I'm swanning round the world looking at the most fabulously interesting things. Such good fortune.

If my grandchildren were to look at me and say, 'You were aware species were disappearing and you did nothing, you said nothing', that I think is culpable. I don't know how much more they expect me to be doing, I'd better ask them.

What humans do over the next 50 years will determine the fate of all life on the planet.