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.

I may find Saddam Hussein's regime abhorrent - any normal person would - but the survival of it is in his hands.

You choose your own reality and you - social media then amplifies those conspiracy theories. So that's why I say social media is itself a revolutionary phenomenon.

Stirring is OK. It just depends what happens in the end.

The 21st century will not be about the battle between capitalism and socialism but between the forces of progress and the forces of conservatism.

The Iraq Survey Group has already found massive evidence of a huge system of clandestine laboratories.

A challenge so far-reaching in its impact and irreversible in its destructive power, that it alters radically human existence... There is no doubt that the time to act is now.