We run around so much - with the best intentions: I want to save the rain forest. I've gotta clean up the oceans. I've gotta save the dolphins. All worthy efforts, but if you're not centered and you don't have the serenity in your life you need to accomplish that task, you're not going to do a very good job.

You cannot be quiet about things that you know.

I think people love nature after they experience it. I know I experienced it as a young man - I took a lot of hikes, I was involved in scouting.

We have lots of other problems with plastic in our oceans. There are five different big gyres of plastic out in the ocean. There are problems with air pollution around the country that we need to deal with, and around the world. We have a great many problems to overcome, so I work on a lot of different boards trying to help in those important areas.

It's something I passed on to my kids. They really love the earth because they've experienced it from the youngest age. They know where food comes from - it doesn't come from the Safeway bush or the Ralph's tree. It comes from the earth. And water and sunshine and nutrients. My children understand that because they've experienced it. I feel successful as a parent, having done that.

The film 'Tapped' illustrates quite clearly how we've been getting 'soaked' for years by the bottled water industry.

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.