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.

The biggest opportunity in 2013 is in Africa. It has seven out of the ten fastest-growing economies in the world. In Nigeria alone there are 100 million people with mobile phones. In total, 300 million Africans - five times the population of Britain - are in the middle class.

You know, you only get to live life once, so there are two things that that yields. One is that there's no point in crying over spilt milk, but secondly you hate wasting time, energy, and whatever talent you've got...

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.

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

Turning every business into an environmental industry will involve applying new principles...first, we need to make more with less...second, we need to design out waste...third, we must begin to decarbonise our energy supply

I'm a great believer in the Arsene Wenger school of management - which is, you don't worry about the opposition, you just get your own act together.