Physicians for Social Responsibility is a non-profit advocacy organization that is the medical and public health voice for policies to stop nuclear war and proliferation and to slow, stop and reverse global warming and toxic degradation of the environment. PSRs 32,400 medical and health professionals and concerned citizen members, 31 PSR chapters, over 60 Student PSR chapters at medical and public health schools, and over 25,000 e-activists, along with national and chapter board members and staff, form a unique nationwide network committed to a safe and healthy world.