Countdown to Zero

Writer/director Lucy Walker, producer Lawrence Bender, and former CIA Covert Operations officer Valerie Plame Wilson discuss the documentary, “Countdown to Zero,” which explores the dangers of nuclear weapons, exposing a variety of present-day threats, and features a host of international experts and world leaders who advocate total global disarmament. “Countdown to Zero” opens July 23 at AMC Empire and the Angelika Film Center.