I am really sobered by what's happening to ecosystems around our planet and to the wildlife that is to be found there.

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.

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.

What drives me is that moment of discovery. I love the unknown.

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'm glad I'm inspiring somebody.

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