Offers a conceptual pathway for U.S. policymakers to begin recalibrating America's security role to reverse what has appeared to be a widening gap between U.S. ends and means, now and in the future. Provides an overview of eight broad trends shaping the international security environment; a global analysis of the world's seven regions, to consider important developments in their distinctive neighborhoods; and, an examination of prospective U.S. contributions, military capabilities and force structure, national security organization, alliances and partnerships, and strategies.

Provides an overview of eight broad trends shaping the international security environment; a global analysis of the world's seven regions, to consider important developments in their distinctive neighborhoods; and, an examination of prospective U.S. contributions, military capabilities and force structure, national security organization, alliances and partnerships, and strategies.

Grand strategy integrates military, political, and economic means to pursue states ultimate objectives in the international system. American grand strategy had been in a state of ux prior to 2001, as containment of the Soviet Union gave way to a wider range of apparently lesser challenges. The 9/11 attacks on the Pentagon and the World Trade towers, however, transformed the grand strategy debate and led to a sweeping reevaluation of American security policy. It may still be too early to expect this reevaluation to have produced a complete or nal response to 9/11 policies as complex as national grand strategy do not change overnight. But after 3 years of sustained debate and adaptation, it is reasonable to ask what this process has produced so far, and how well the results to date serve American interests.

Summarizes the science of climate change and impacts on the United States, for the public and policymakers.