The most profound security threat we face today is global warming....climate change has the capacity to change the way all of us live.

Just because we cannot do everything for everyone does not mean we should do nothing for anyone.

Our military superiority is so great - it's far greater than it was in the Gulf War, and the Gulf War was over in 100 hours after we bombed for 43 days. And so now they can bomb for a couple of days and then just roll into Baghdad... The odds are there's going to be a war and it's going to be not for very long.

The Kyoto Treaty wasn't perfect, but we signed it, in fact, helped to draft it. And I'm very proud of it, it was the world's first commitment to doing something comprehensive on greenhouse gases and trying to reduce global warming before we do irreversible damage to many civilizations around the world.

Won't it be sad to have an Internet connection to Mars if there are no Martians to write to or e-mail us?

It is dangerously destabilizing to have half the world on the cutting edge of technology while the other half struggles on the bare edge of survival.

In the emerging global economy, everything is mobile: capital, factories, even entire industries. The only resource that's really rooted in a nation--and the ultimate source of all its wealth--is its people.