I have long believed this interdependence defines the new world we live in.

When Europe and America stand together the world is a better and more prosperous place.

Our task is not to fight old battles, but to show that there is a third way, a way of marrying together an open competitive society and successful economy with a just and decent society.

What the commission that myself and Leon Panetta is trying to do is analyze this in two respects. First of all, what's the right military response and security response?

My office is on Twitter. I don't tweet myself - at least, not intentionally, but I probably should do.

Look, I am very competitive.

Climate change is the world's greatest environmental challenge. It is now plain that the emission of greenhouse gases, associated with industrialization and economic growth...is causing global warming at a rate that is unsustainable.