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

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.

I let my [past] life in peripherally, because I'm interested in what's over there; I want to keep going forward.

I don't get a sense that Cheers is revered the way it should be by [younger viewers]. In my mind, it's a show that should always, always, always be in the pantheon. But can it ever mean to future generations what it meant to us?

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.

Sharks have swum the oceans for over 400 million years, but we're threatening this critically important species for the purpose of making soup - it's sad and wasteful.

We need to start looking at having a way of managing the whole ecosystem, because you can't pick away at it piece by piece, you have to truly start being coordinated and managing our resources as a system. We haven't gotten to that point yet.