I think that what most surprises anybody who goes into politics from even a modestly cerebral background is the vulgarity of much of the cut and thrust of politics.

Multilateralism is not an easy option. We're going to find that the world is very difficult. And relationships between America and the rest of the world are very difficult.

But the ability to articulate what you are doing, to be clear about it, and to stick to it is, I think, the essence of political leadership.

It'd make a wonderful change to have the leader of a pluralist democracy who acted on that, who told people just how tough things are going to be, just what's going to have to be done - and, maybe, ran all the risks on the side of honesty, rather than spinning stories and trying to win the headlines every day.

You don't have to wait until people say they accept everything you say until you are actually prepared to sit down and discuss matters with them.

I don't think that capitalism should be unbridled, if by "unbridled" you mean unregulated.

Undoubtedly, at the moment, the major cause of CO2 emission is what happens in developed countries.