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The report argues that climate change will increasingly exacerbate risks to US national security by intensifying physical impacts and mounting geopolitical tensions over the energy transition. It identifies a likely increase in cross-border conflicts over water and migration, strategic competition in the Arctic, and the risk of unilateral solar geoengineering. The document highlights 11 highly vulnerable countries and two regions (Central Africa and Pacific island states) where climate-induced instability may necessitate increased US diplomatic, humanitarian, and military resources. It also notes that current global policies are insufficient to meet Paris Agreement goals, leading to competition over critical minerals and technologies.