Many of the world’s mayors, including NYC’s Mike Bloomberg, are participating in the Mayors’ Climate Change Summit in Copenhagen this week. Stephen Hammer, director of the Urban Energy Program at Columbia University's Center for Energy, Marine Transportation and Public Policy, talks about what are they hoping to accomplish and what it means for NYC. Plus, Shahzeen Attari, Earth Institute postdoctoral fellow at the Center for Research on Environmental Decisions reports on her recent presentation at the conference about human behavior in regard to climate change.