Summary: In this week's McKinsey Quarterly podcast, we talk with Ken Lieberthal, director of the John L. Thornton China Center and senior fellow in Foreign Policy and Global Economy and Development at the Brookings Institution. Lieberthal discusses the mutual distrust between the US and China on climate change policy and how that might be turned around to create a powerful and effective partnership for change. He spoke with the Quarterly in Washington, D.C. in June 2009.