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 2 we'll look at the issues of equity and access to new technologies, the importance of strong leadership, opportunities with public-private and university partnerships, the imperative of tracking progress and the delicate balance of privacy, security and transparency.