Coming back to a television series puts you back in the limelight and gives you a platform for your ideas. If you're not acting on a series, you don't get the ability to communicate to people.

We don't have to sacrifice a strong economy for a healthy environment.

If we were driving pure hydrogen automobiles, that automobile would actually help clean up the air because the air coming out of the exhaust would be cleaner than the air going into the engine intake.

But the "wise" person understands something else— that we are all connected and, therefore, his or her own happiness must include the happiness of others.

It's not an if - we're going to have to change. Oil is simply going to be gone.

The earth is a tremendous gift. There is nothing else like it in the known universe. I want to leave it the way I found it.

The people of the future will say, 'meat-eaters!' in disgust and regard us in the same way that we regard cannibals and cannibalism.