We know that when we protect our oceans we're protecting our future.

I know that the precise magnitude and patterns of climate change cannot be fully predicted. But global warming clearly is a growing, long-term threat with profound consequences. And make no mistake about it, it will take decades to reverse.

We need to help younger people recognize their own capacity to do good, and help them discover the rewards of generosity.

Just because you can't do everything, it doesn't mean you shouldn't do what you can.

People should really take care when they vote, and pay more attention to what people say they're going to do - instead of just how they feel about how things are going.

You don't have to wait till your party's in power to have an impact on life at home and around the world.

My father left me with the feeling that I had to live for two people, and that if I did it well enough, somehow I could make up for the life he should have had. And his memory infused me, at a younger age than most, with a sense of my own mortality. The knowledge that I, too, could die young drove me both to try to drain the most out of every moment of life and to get on with the next big challenge. Even when I wasn't sure where I was going, I was always in a hurry.