Whether U.S. EPA and states can regulate emissions outside the facility fenceline is a critical factor in shaping the regulatory response to climate change using Clean Air Act Section 111. There has been much rhetoric about the ability of states and EPA to create regulatory tools but policy experts and professionals need a more definitive answer. To address this topic two expert teams will argue the resolution, ask questions of the other side, and identify points of agreement and disagreement at the Environmental Law Institute, Washington, DC and via teleconference.