Navigating Change in the Automotive Industry: GM's Electric Future

G.M. produces more than 20 times as many cars as Tesla, but Tesla is worth nearly 10 times as much. Mary Barra, the C.E.O. of G.M., is trying to fix that. We speak with her about the race toward an electrified (and autonomous) future, China and Trump, and what it’s like to be the “fifth-most powerful woman in the world.”