I've always been more interested in organisms that can move on their own than in stationary plants. But when I canoe or hike along the edge of lakes or oceans and see trees that seem to be growing out of rock faces, I am blown away. How do they do it?

The failure of world leaders to act on the critical issue of global warming is often blamed on economic considerations.

The future doesn't exist. The only thing that exists is now and our memory of what happened in the past. But because we invented the idea of a future, we're the only animal that realized we can affect the future by what we do today.

If America wants to retain its position as a global power, its president must listen to the people and show strong leadership at this turning point in human history.

That's why I wrote this book: to show how these people can imbue us with hope. I read somewhere that when a person takes part in community action, his health improves. Something happens to him or to her biologically. It's like a tonic.

I don't generally exercise that much. I exercised a great deal in my life - at times. In periods.

The biggest thing in my life - the biggest - is raising dollars to help kids battle cancer.

I think sometimes less is more. I don't think it helps to overdo exercising - I think you need to do it to keep your body healthy and fit, but there is a fine line between, you know, healthy and obsession. You have to build your foundation first. Your brain has to sort of connect to your body.