By 'flat' I did not mean that the world is getting equal. I said that more people in more places can now compete, connect and collaborate with equal power and equal tools than ever before. That's why an Indian in Bangalore can take care of the office work of American doctors or read the X-rays of German hospitals.

I don't think we replaced the Soviet Union with Al Qaida. I think we replaced, we should have, Soviet Union with the merger of globalization and the IT revolution. I think it's that. That is the real challenge that we face today. Unlike the Soviet Union, it has no face, it has no missiles, but it is something that challenges every job, every city and every community.

I was in Bangalore, India, the Silicon Valley of India, when I realized that the world was flat.

There is definitely global warming, and man is definitely contributing to it. Go out to, say, Montana and talk to some pretty conservative people, hunters and fishermen. They know that in the trout stream they fished when they were growing up, the trout are stressed because the water temperature is going up. They know the hunting season has been delayed because the snows are coming later, and therefore the elk aren't coming down from the mountains.

Oil is a tangible commodity, so there is a global market. The fact that we may need less may affect the global price because we're big consumers: we probably take about a quarter of global demand. But if suddenly, let's just use a crazy example, fighting in the Middle East led to the closure of the Strait of Hormuz and no oil could get out through the Strait of Hormuz, well that would affect China, India, Europe, it will affect the whole global economy. It will affect us, too, then.

If you don't visit a bad neighborhood, it might visit you.

The philosopher Ludwig Wittgenstein once remarked that if you ask a man how much is two plus two and he tells you five, that is a mistake. But if you ask a man how much is two plus two and he tells you ninety-seven, that is no longer a mistake. The man you are talking to is operating with a wholly different logic from your own.