We all want "smart cities," but how do we get there? Orlando's Sustainability Director Chris Castro is a leader in this field, and he talks about what he sees as the "nexus between sustainability and technology." He shares examples of what's working in Orlando, challenges cities face on this path, and what he sees as the next big thing. In Part 1 we talk about how smart cities integrate with what's already happening with sustainability and the challenges that local governments face in this realm.