Bertie speaks to Sherri Goodman about her new book, Threat Multiplier:Climate, Military Leadership, and the Fight for Global Security. From 1993-2001, Sherri Goodman served as the first US Deputy Undersecretary of Defense for Environmental Security, making her the Pentagon's Chief Environmental Officer. She then went on to help deliver influential reports that helped to establish climate change as a national security threat in the US. Threat Multiplier documents key environmental and cl...