Seven years ago, when I started free soloing long, hard routes in Yosemite - climbing without a rope, gear or a partner - I did it because it seemed like the purest, most elegant way to scale big walls. Climbing, especially soloing, felt like a grand adventure, but I never dreamed it could be a profession.

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.

You can compromise between good, better, and best, and you can compromise between bad and worse and terrible. But you can't compromise between good and evil. And now people look at the other side as a completely different kind of animal and say, 'They are taking the country down the road to purgatory.' It's complete intolerance.

It has become impossible to give up the enterprise of disarmament without abandoning the whole great adventure of building up a collective peace system.

As I began making my feature films, it was a great adventure. It was about constructing something I saw in my head or I had designed on storyboards and capturing that on film.

We love because it's the only true adventure.