As the wide-ranging effects of climate change on ecosystems, societies, and the global economy become increasingly clear, the need for international cooperation to address climate challenges is likewise growing. Whether through melting glaciers, harsher and longer wildfire seasons, or more severe storms, the impacts are global, and the response to the changing climate must be global as well. As two of the world’s most advanced economies, with a strong tradition of cooperation, the United States and the Republic of Korea (ROK) are working to lead the way on global efforts to address climate change and build energy systems to both mitigate and adapt to these changes.