"Political Opportunities for Climate Policy is a must-read book for everyone keen on understanding climate change policy at the national and state level in the United States today and the prospects for the future. First, it provides a detailed yet succinct description of what those policies are and how they have evolved. It provides an especially important in-depth analysis of California and New York, which have emerged as climate policy leaders in the context of the US federal system [with] policies comparable to other industrialized nations. Second, Karapin addresses the issue of how best to explain California and New York policy leadership in light of the three prominent theories in the fields of political science and public policy: Kingdon's "windows of opportunity", Sabatier's "advocacy coalition framework", and Collier's "path dependence". He concludes with a persuasive theoretical synthesis, on the basis of which the challenges and opportunities for addressing the growing challenge of climate change in the US become clear." Daniel A. Mazmanian, University of Southern California.