Ecological Economics201 (November 2022) (with Charles F. Manski and Alan H. Sanstad) https://authors.elsevier.com/sd/article/S0921-8009(22)00214-2 Abstract Integrated assessment models have become the primary tools for comparing climate policies aimed at reducing greenhouse gas emissions. Such policies have often been identified by considering a planner who seeks to make optimal trade-offs between the costs of carbon abatement and the economic damages from climate change. The planning proble...