Britain’s National Security Strategy has warned that climate change could have a significant impact on the lives of its citizens. Similar warnings have emerged in the United States, where officials have described climate change as a potentially existential challenge. Read more: Climate Change: Educational OversightLawmakers in both countries argue that the UK-US national security threat linked to climate change requires stronger international cooperation. Read more: National Security Policy: Gap AnalysisThe UK-US national security threat posed by climate change highlights the need for both countries to learn from each other while developing practical solutions. The broader message is that climate policy, energy security and national security are becoming increasingly interconnected.