We're not trying to reinvent the wheel; for any environmental organization to claim sole responsibility for any kind of victory is insane, because everybody attacks these problems as a group.

The biggest danger we face is overfishing. We literally could fish out our oceans, some scientists believe, in the next 40, 50, 60 years. We are fishing out the top of the food chain, and it's pretty crucial because about 200 million people depend on fish and fishing for their livelihood, and about a billion people, mostly in poorer countries, depend on fish for their protein. So this is a big problem. Good news is, it's fixable.

The planet will survive. Whether we get to be here and enjoy it, or enjoy life as we've known it, is what's questionable.

How much do you engage yourself in what's truly real and important in life? That's the individual question.

I was going through so many changes in my life - separation with my wife, having an affair - that was all very messy and public. It felt like if I really wanted to rock my boat and make changes in my life and who I am and how I am, that would also mean moving on from Cheers.

I had trouble hanging around [Shelley Long] until we stood onstage together, and then I was in heaven.

It's not enough to have good thoughts for the world. You must get out there! It is also really important that each person realise their own worth. If you don't think you're good enough, how can you turn around and help save the world?