This week on Smart City we'll talk to the creator of one of my favorite websites, Walkscore.com.  Matt Lerner is the Chief Technology Officer of Frontseat.org, a company that builds software for civic life.  He'll tell us about making software that makes the world a better place.

And we'll talk to Sadhu Johnston.  Sadhu is completing his tenure as Chicago's Chief Environmental Officer where he's been making Chicago a better place. He'll tell us about the challenges in implementing real change in the city, and how cities are co-operating instead of competing to make a real difference in climate change.