We must all be profoundly grateful for the magnificent achievements of our forbearers in this century. Yet perhaps in the daily press of events, in the clash of controversy, we don't see our own time for what it truly is - a new dawn for America.

First, I worry about climate change. It's the only thing that I believe has the power to fundamentally end the march of civilization as we know it, and make a lot of the other efforts that we're making irrelevant and impossible.

Most of the major mistakes I made in my life, I made when I was too tired to know what I was doing - both personally and professionally.

I think that most small amounts of marijuana have been decriminalized in some places, and should be. We really need a re-examination of our entire policy on imprisonment...Our imprisonment policies are counterproductive.

The new energy future is decentralised, entrepreneurial and needs people like you to say 'Give me a clean car, give me solar shingles to put on my roof - give me a clean future'

I hate that man Obama more than any man I've ever met, more than any man who ever lived.

I like the job. That's what I'll miss the most... I'm not sure anybody ever liked this as much as I've liked it.