We study the political economy of carbon taxes when neoclassical consumers take all other agents' emissions as given and socially responsible consumers internalize damages in a group-rule-utilitarian way, taking neoclassical consumers' behavior as given. We characterize political equilibrium taxes with a focus on deviations from first-best Pigouvian taxation. Welfare falls further if arguments on moral obligations to reduce carbon footprints polarize the debate in society. Finally, we present survey evidence that supports our theory: social responsibility correlates with lower consumption of brown goods, higher preferred carbon taxes, and support for moral arguments.

