You have to work with the auto industry, the oil companies, you have to work to develop renewable fuel, whether it's solar or different kinds of fuel.

My job playing Sam Malone was to let the audience in, to love my bar full of people. And that informed my life. I mean, we're so different [in the cast], some of us. Miles apart. [But] when I see anyone from those days, I tap into that instant love for them.

Around year seven or eight, you'd kill yourself when you realized Norm had to enter and you had to come up with a new beer joke.

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.

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?

It is important to remember that the ocean's resources are finite. The commitment these kids are making here today is a clear and compelling call to all of us to pay attention to our ocean.

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.