See, I don't get the sense that you need to direct at all. Sometimes I get the opposite sensation from you, that you're like, "I really should go do something else." But then you are drawn back in by a particular story, like a hangnail in the brain.

Everyone thinks that Fight Club is a very important and successful film, but it was a massive box-office failure. Massive. It was a big flop by any commercial-release standard. And it's been a huge hit on DVD. Everything that movie has become has been on DVD. So you can't stake your sense of creative success on this whole box-office-performance matrix, because if you do, you're going to be disappointed most of the time.

When I look at the directors that I really love, who really develop their films over time, they're almost always the ones who go back again and again and again at the same investigations. I think that when somebody has a theme they go after, it's fun to service that. It's like, "I know you now. I know what you go at." It helps you locate yourself a little bit quicker in their world.

Remarkably, there's no green screen in 'Leaves of Grass' movie. There is motion control. Technically, there were all sorts of challenges, but really the soul of it is Edward Norton talent. You write these characters when you write a movie, and all you can hope for or depend on is that your actors will elevate the material.

Basically, I think 21st century conservation is moving toward preserving ecosystems by dealing with the needs of people.

Look, you've got a generation of people coming along who are going to form their own new relationship with the idea of supporting the causes that they care about or changing the world. And these people are not going to do it the way our parents do it.

We must realize that nature is absolutely essential for our survival, and we must act on that premise now.