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Is climate change a valid national security issue for the United States? Even taking a narrow definition of national security issues-threats to a state's core values for which it would be willing to go to war or use force, one can identify a number of ways in which climate change already constitutes a national security issue to which security specialists in the United States should pay attention. In part 1, I explore the definitional terrain of "environmental security" by offering an account of "national security" and "grand strategy" that accords with traditional conceptions of security. I also identify criteria by which climate change could constitute a threat to national security and the U.S. in particular. In parts 2-4, I assess whether the potential effects of climate change constitute national security threats for the United States. In part 2, I examine the directs effects of climate change on the territorial United States, including abrupt climate change and extreme weather events. In part 3, I discuss the effects of climate change on the extraterritorial interests of the U.S. including the links between extreme weather events and violent conflict, natural disasters and humanitarian intervention, and, finally, climate change and soft power. The final section explores the security externalities of energy and climate change, looking at the links between oil dependence, terrorism, and climate change as well as the proliferation problems associated nuclear power as a remedy for climate change. ..PAT.-Unpublished Manuscript [ABSTRACT FROM AUTHOR]