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 is particularly appropriate that we unveil this campaign on this first day of the annual international coastal clean-up effort. Beach cleanups are something each of us can do any time of the year. I'm proud to be participating in the cleanup efforts today and I encourage everyone to make the time for these types of activities.

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?

I feel very strongly that you can't just beat people up anymore; you have to work hand in hand and find ways to compromise, and get big business involved, because it won't happen otherwise.

The environmental movement, like all political processes, reacts best to disasters. But these are very slow, very gradual disasters in the making.

We are so arrogant, we forget that we are not the reason for evolution, we are not the point of evolution. We are part of evolution. Unfortunately, we believe that we've been created to dominate the planet, to dominate nature. Ain't true.

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.