Given the state of affairs in Ukraine and the Middle East and the rise of China as a chief U.S. adversary, one would assume that the Department of Defense has its hands full combating real threats to U.S. national security. One would also assume that under the fraught geopolitics of the current world, the Department of Defense (DoD) would be harnessing its precious resources toward identifying future menaces that literally pose an existential threat to the security of the United States. Climate change does not constitute a current threat to U.S. national security. However, the leaders of the DoD think...