Gary Hart has long been one of the nation's foremost experts on national security, combining a deep knowledge of national security policy with first-hand experience of the political realities that influence how America safeguards itself and its interests. In his new book, Hart outlines the fundamental changes with which America must grapple when confronting the current terrorist threat—a threat with no state and no geographic home-base and thus no real target for the world's largest and most sophisticated military force. Hart argues for a security of the commons, emphasizing that the new security will require a shield for the homeland as well as a cloak of non-military security, including security of income, community, environment, and energy.