We live in a time where we have more extinction happening on our planet than since the dinosaurs were wiped out 50 million years ago.

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

To be with another scientist and make a discovery and share that with a global audience, or working with bear biologists in Alaska, by helicopter - [it's] really what I've given my whole life to. And I get to do that just about every week.

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.

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.

We live in a time where we have more extinction happening on our planet than since the dinosaurs were wiped out 50 million years ago.

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