David Victor, co-chair of the Energy Security and Climate Initiative at Brookings and professor of international relations at the University of California, San Diego, and Christopher Clack, CEO of Vibrant Clean Energy, discuss the complexities of adopting sources of renewable energy, why the U.S. grid presents a unique challenge, and the political and economic challenges facing the pursuit of zero-carbon emission energy. Full show notes available here: http://brook.gs/2eO5qiz  Subscribe to Intersections here or on iTunes, send feedback email to intersections@brookings.edu, and follow us and tweet us at @policypodcasts on Twitter. Intersections is part of the Brookings Podcast Network.