The United States of America and the People's Republic of China are both key players in international efforts to address global warming and global energy security. Indeed, they are by far the two largest emitters of greenhouse gases (GHGs) in the world, together accounting for over 40% of global CO2 emissions from fossil fuel use. Efforts by these two players over the coming decades to cut greenhouse gas emissions and energy consumption will play a large role in determining the ultimate outcome of efforts to combat global warming. They are, of course, not alone in this effort, but they are the critical actors, jointly holding the key to either sustainability or catastrophe. Building upon NRDC's experience in China and the international global warming negotiations, this paper recommends nine key steps for the incoming Obama administration, US Congress, and leaders in China to strengthen US-China Climate Change and Energy Engagement.