Join host Ronnie Lipschutz in welcoming Dr. Helen Caldicott to Sustainability Now!, live from Australia, to talk about the looming threat of nuclear war. According to Dr. Caldicott, the nuclear doomsday clock of The Bulletin of the Atomic Scientists is set at 100 seconds to Midnight, but 20 seconds is closer to the mark. Dr. Caldicott has devoted the last forty-two years to an international campaign to educate the public about the medical hazards of the nuclear age and the necessary changes in human behavior to stop environmental destruction and nuclear catastrophe. She calls this “Global Preventive Medicine.” Caldicott is also the subject of “If You Love This Planet,” which won an Academy Award in 1982 for best documentary.