It feels like just a year ago that I was traveling down the Mississippi in search of sustainable cities. Well, I'm on the road again -- this time with a much more ambitious itinerary: 15 cities, 15 days, destination: green. I'm in San Francisco right now, but I'm headed all the way across the country, baby.

And dude, I'm getting a Dell! Actually, I'm getting a Todd Dwyer, head blogger for Dell's eco-minded site ReGeneration.org. The two of us are hitting the road (in a Prius!) seeking the leaders, big and small, of our sustainable future -- whether that means talking to Van Jones about creating jobs in a green economy or learning about the latest in eco-innovation at Tesla Motors. And, hey, if I have to test-drive a new Roadster, well, that's a sacrifice I'm willing to make.

Stay tuned for updates, images, and video clips from the road. As true digital nomads, we'll also be keeping in touch via Twitter, Facebook, and other social media -- and we'll be expecting you to share in our journey. We want you to ask your questions about what's ahead, tell us what you're doing to make a difference, and give us advice about where to grab our next meal.

For now, though, it's time to hit the road -- full speed ahead, destination: green.

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