It created a global platform that allowed more people to plug and play, collaborate and compete, share knowledge and share work, than anything we have ever seen in the history of the world.

I am being very humble about the Arab Spring. There's kind of a competition out there, you might have noticed, of who can be the first to say the Arab Spring is going to fail. Everyone says, "I told you so, I told you so about the Muslim Brotherhood." I have no desire to tell anyone anything. I don't know. I'm just listening, watching. It may turn out all these people are right, they may be wrong. They may be right this year and wrong next year, by the way. I'm just trying to listen day to day, figure it out.

What about the rest of life? Respect for the sanctity of life, if you believe that it begins at conception, cannot end at birth.

That's right-the striking thing about greenhouse gases is the diversity of sources that emit them. A herd of cattle belching can be worse than highway full of hummers.

So what am I? I guess I would call myself a sober optimist...If you are not sober about the scale of the challenge, then you are not paying attention. But if you are not an optimist, you have no chance of generating the kind of mass movement needed to achieve the needed scale.

The thing you have to remember is, oil and gas are commodities, and the more we use them the more the price goes up, like any commodity. Solar, wind - they are technologies, so the more you use them, the more the price goes down.

There is no substitute for face-to-face reporting and research.