I would be absolutely astounded if population growth and industrialisation and all the stuff we are pumping into the atmosphere hadn't changed the climatic balance. Of course it has. There is no valid argument for denial.

Its about cherishing the woodland at the bottom of your garden or the stream that runs through it. It affects every aspect of life.

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.

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

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

The climate, the economic situation, rising birth rates; none of these things give me a lot of hope or reason to be optimistic.

Very few species have survived unchanged. There's one called lingula, which is a little shellfish, a little brachiopod about the size of my fingernail, that has survived for 500 million years, but it's survived by being unobtrusive and doing nothing, and you can't accuse human beings of that.