We all have to learn to live together.

Let me be clear: we are still a nation of immigrants, and we honor all those immigrants who are working hard to become new citizens.

Edgar Wayburn has worked to preserve the most breath-taking examples of the American landscape. In fact, over the course of more than a half-century, both as President of the Sierra Club and as a private citizen, he has saved more of our wilderness than any person alive.

I mean, you know, this idea that somebody we disagree with on economic or social policy or something we have to turn into some kind of ogre or demon, I think, is a mistake. I mean, it's like telling the American people or half the American people that don't agree with you they're all fools. That's just not true.

To realize the full possibilities of this economy, we must reach beyond our own borders, to shape the revolution that is tearing down barriers and building new networks among nations and individuals, and economies and cultures: globalization. It's the central reality of our time.

That everybody can do something, without regard to how old or young they are, rich or poor or middle class they are, how busy or not busy they are and what level skills they have. Everyone can do something. And everybody should do something. ... And if you do it, you'll be happier.

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.