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

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

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'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.

Whether it's exploring the woods around where I grew up, or even today exploring the coastal habitats and environments where I live in New England, or in a remote wilderness we're featuring in one of my series - I love to be in the field and I love to explore.

We know that when push comes to shove, [we can] drive ourselves to save our planet.

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