To explore the ability of non-federal actors in the U.S. to mitigate climate change, the Phoenix Sustainability Initiative hosted a conversation with Chris Wheat, director of strategy and city engagement for the American Cities Climate Challenge at the Natural Resources Defense Council (NRDC) on May 8, 2019, to a packed auditorium in the Saieh Hall for Economics on the University of Chicago campus. EPIC’s Amir Jina, an assistant professor at the Harris School of Public Policy, moderated the discussion.