Dangerous climate change... It's important not to be alarmist but it is very important to be alarmed

The problems that the world faces - from nuclear proliferation to climate change - can't be tackled by the West alone. They need a coalition of not just West and East, but they need a coalition of Christian and Jew and Muslim.

My advice is very simple: if you can win a small battle, it gives you confidence in the political process to take on bigger battles, and so it is very much a bottom-up grass-roots way of doing politics.

The science is getting worse faster than the politics is getting better.

Consuming three planets' worth of resources when in fact we have one is the environmental equivalent of childhood obesity - eating until you make yourself sick.

If you decide to run for the leadership, you have to go through it with the people you love. But you also have to protect them and I am determined to protect my mum.

I abhor anything that constitutes torture. Water-boarding, its perfectly clear to me it is torture. I never supported extraordinary rendition to torture, always said that Guantanamo should be closed. There is no clash of ideals and pragmatism there.