Until humanity manages to sort itself out and get a co-ordinated view about the planet, it's going to get worse and worse.

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

I'm not over-fond of animals. I am merely astounded by them.

I don't run a car, have never run a car. I could say that this is because I have this extremely tender environmentalist conscience, but the fact is I hate driving.

It's coming home to roost over the next 50 years or so. It's not just climate change; it's sheer space, places to grow food for this enormous horde. Either we limit our population growth or the natural world will do it for us, and the natural world is doing it for us right now.

Life is not all high emotion. Some of the most interesting things are when its not highly emotional: little details of relationships and body language.

The most extraordinary thing about trying to piece together the missing links in the evolutionary story is that when you do find a missing link and put it in the story, you suddenly need all these other missing links to connect to the new discovery. The gaps and questions actually increase - it's extraordinary.