There's a constant tension in climbing, and really all exploration, between pushing yourself into the unknown but trying not to push too far. The best any of us can do is to tread that line carefully.

Yosemite has the most impressive and accessible granite big walls in the world. The rock is amazing. And because of that, it's been the mecca for climbing in the U.S. - and the world to a large degree - for all of climbing history. It's the place to test yourself against the historic routes of the past.

I'm sponsored by the solar company Goal Zero, and they were gracious enough to install panels on my van and a nice battery system for the inside. I have lights and a fridge inside the van. And of course I had panels installed on my mom's house.

I've tried to approach environmentalism the same way I do my climbing: by setting small, concrete goals that build on each other.

When I travel and speak across the country, I often tell college students that we are making a significant mistake when we say to each other that this criminal justice of ours is broken. To say it's broken would be to suggest that it was well designed and had good intentions from the start.

I was always just into my music and maybe into trying to save the world a little bit. I never really thought I'd have a hit record or anything like that. I was prepared to travel around all over the country, kind of like a Johnny Appleseed, and sing.

My writing is a combination of three elements. The first is travel: not travel like a tourist, but travel as exploration. The second is reading literature on the subject. The third is reflection.

Golf is growing, and there are more good young players, but you don't see them going abroad. It's so expensive to travel.