I'm on the board of the Sierra Club Foundation and am myself a big environmentalist. But the way to make the biggest difference is to change mainstream behavior.

I just am a clean air freak. I grew up in the woods. I worked in China for a bit and was exposed to all the resources being used and the pollution and felt strongly that for our generation, the biggest economic and societal problem is energy.

Prior to SunRun, I was headed toward a career in venture capital and then realized I wanted to apply my knowledge of finance more directly to helping change the world.

For me, not owning a car means I may spend a little extra time on public transportation, but I can use that time to read, catch up on work projects, and make the phone calls I couldn't get to earlier. Plus, I never waste time at the mechanics or gas station.

I am a humanist not a feminist. There's a big difference.

When you're a kid, you have these big ideas and these big dreams to make a change, or maybe you feel like you can't make a difference.