I was recently looking at what they can actually do to reduce consumption of petrol. It would be quite possible to build automobiles out of carbon fibre that would be just as strong, weigh 10 times less and consume 10 times less petrol.

It seems to be the thing now that young people are getting back into politics.

What I worry about is climate change, because that would have untold effects that we can't even measure yet.

Markets cant think about anything beyond about three months. This is very long-term for markets, which is why the important things in life have got to be taken outside of the marketplace.

I'm a radical reformist, because between where we are and where I want to go there's a great deal of work, and I won't see the end of this.

The question is not only what is grown but what it's used for. There's not going to be a mass transformation of dietary habits in rich countries-on the contrary, the first thing people do when they become more prosperous is to buy more meat.

There's people coming in who've never done any politics at all, who've never been in a trade union, they've never been in a political party, they've never done anything, but they do feel a kind of urgency.