The two most abundant forms of power on earth are solar and wind, and they're getting cheaper and cheaper.

You can't just do one of the things, because it won't be enough to combat the climate change that we're already starting to experience. It will only get worse.

This is a deeply spiritual issue...Do we want to spend more time trying to care for our fellow man or do we want to just pursue more virtual reality? That's the issue before us.. and it's being played out in the world of the environment.

I've been in movies with Meryl Streep, Jack Nicholson - but I was on 'The Simpsons,' and finally, in the eyes of my children, I was a star.

When you're in the public eye - whether it be entertainment, sports, medicine, politics, whatever way - you have an opportunity, and I think also an obligation and a responsibility, to disseminate good information.

People are overwhelmed looking up at the Mount Everest of environmental challenges that we face. But you put one foot in front of the other and you recognize that not everyone is Sir Edmund Hillary.

My favorite form of transportation is walking. I live in a neighborhood where you can walk to restaurants, banks, and shops.