I think that the environment is very a complicated question. I am very sympathetic to people who support the environment who live in the United States. I am very sympathetic to people who don't support the environment who live in a very poor country.

Climate is a global issue. Coal is still the energy that is being used more than anything else to make electricity. The United States is using less as we're turning more to gas. But, around the world, that's what they're using.

There is too large a divergence at the moment in the interests and values of the world's most powerful states.

I believe that if you go and ask a chief executive of a Goldman Sachs or a BP, and they answer you honestly they want monopolies, they want government subsidies, they want preferences - they're not interested in free markets.

Strong states and blocs of strong states are the only source of power and legitimacy capable of driving an international agenda in today's world.

The two world wars boosted American power and devastated potential rivals to an extent that could not have lasted more than a few decades.

I think political science is bad at prediction. We don't gaze into a crystal ball. I do not believe that we predict things.