Mayors from around the world convened this week in New York to get serious about climate change. They have a growing number of examples to learn from and one of the best is Starbucks. Tony Gale, the company's Corporate Architect, is with us to share the ground-breaking work Starbucks is doing to make its stores green and how its work can influence others.

Dr. Joe Schwieterman is Director of DePaul University's Chaddick Institute, which promotes effective urban planning. Today, effective urban planning means sustainable urban planning, and the biggest chits in play are transportation and buildings.

We'll talk about sustainability and how cities are achieving it this week on Smart City.