Sometimes, when my wife and I were going out to dinner, I would take my laptop with me and work in the car, so as to take advantage of the half hour going and coming.

America is the greatest engine of innovation that has ever existed, and it can't be duplicated anytime soon, because it is the product of a multitude of factors: extreme freedom of thought, an emphasis on independent thinking, a steady immigration of new minds, a risk-taking culture with no stigma attached to trying and failing, a noncorrupt bureaucracy, and financial markets and a venture capital system that are unrivaled at taking new ideas and turning them into global products.

When I was growing up, my parents told me, 'Finish your dinner. People in China and India are starving.' I tell my daughters, 'Finish your homework. People in India and China are starving for your job.'

What I want is natural gas to be a bridge to a cleaner energy future, not a dam against a cleaner energy future, not a dead end. To get this right, to get the most out of it, we not only have to make sure we exploit natural gas in a clean way - it's a challenge - but we also have to make sure that we are instilling and implementing all the incentives to win solar, nuclear energy efficiency that will make them continually competitive with natural gas in the future.

The ideal country in a flat world is the one with no natural resources, because countries with no natural resources tend to dig inside themselves. They try to tap the energy, entrepreneurship, creativity, and intelligence of their own people-men and women-rather than drill an oil well.

When people get frustrated, it's when they feel they are living in a context that deprives them of dignity, deprives them of justice and deprives them of the freedom to realize their full potential, and that to me is what the Arab awakening was all about. I think it applied to every country, and so I have been an unmitigated supporter of it.

Pessimists are usually right and optimists are usually wrong but all the great changes have been accomplished by optimists.