Why are some countries more successful at advancing the clean energy transition than others? Existing research, centered on industrialized democracies, often frames international collective action against domestic distributive explanations. This review synthesizes many previous comparative and international explanations in a credibility framework that clarifies when governments can reduce opposition and create climate coalitions. Applying it to both developed and developing countries reveals how institutions, state capacity, and global constraints jointly shape decarbonization trajectories and suggests a new research agenda for the political economy of climate change.