能源的未来是低碳的，天然气将发挥重要的过渡作用。

最深刻的真理往往最简单。

The digital revolution has transformed the way we think about markets, competition, and economic policy.

I've been waiting more than 30 years to say this: "Dad, I always told you I'd come back and get my degree." I want to thank Harvard for this timely honor. I'll be changing my job next year…and it will be nice to finally have a college degree on my resume.