With the US as the world’s most prominent climate change outlaw, international pressure will not impel domestic action. The key to a successful global warming solution lies closer to home: in state–federal relations. Thomson proposes an innovative climate policy framework called “sophisticated interdependence.” This model is based on her lucid analysis of economic and political forces affecting climate change policy in selected US states, as well as on comparative descriptions of programs in Germany and Brazil, two powerful federal democracies whose policies are critical in the global climate change arena.