The single most articulate and passionate advocate of citizen action to remedy the nuclear and environmental crises, Dr Helen 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. She is a noted author and political activist, and has been the subject of several films, including Eight Minutes to Midnight.  She has also been nominated for the Nobel Peace Prize by Linius Pauling.