As U.S. pulls out of Paris Agreement, what are next steps in fight against climate change?
As the world watched U.S. votes being counted, the country officially pulled out of the Paris Agreement on climate. In a special on climate change, we discuss what that withdrawal means, and what happens next, with Michael E. Mann, a climate scientist and distinguished professor of atmospheric science at Pennsylvania State University; Elan Strait, director of U.S. climate campaigns with the World Wildlife Fund; and Jessica Green, a political science professor specializing in international climate policy at the University of Toronto.