I think a human animal is far more wild and unpredictable and dangerous and destructive than any other animal.

The challenge is that we live in a time where there's a lot of crap on television.

The natural resources we've depended on, if the places where they exist are not stable, our own livelihood and our health is put at risk.

Running is my addiction. It's always present. I'm constantly thinking about my next run.

I'm a biologist. At my core, I'm a naturalist.

Many of the medicines we use today, to fight everything from AIDS to cancer, originate as a toxin in an amphibian skin. When we lose these animals, we lose resources. We lose keystone species in the environments where they live.

I'm really worried about what the world is going to be like when my daughters are young women, [when] they are young leaders or mothers or businesspeople - whatever they're going to be. I'm afraid they're going to have a less healthy and less biologically rich planet.