In my heart, ever since I [was] a little kid, I've been an explorer.

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.

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.

I think the hardest part about my job is the best part of my job - the travel.

We are not far away from the point of no return when it comes to life on earth, and we have some radical choices to make.

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.