The U.S. Congressional Budget Office (CBO) has produced a brief summary of the state of knowledge regarding the potential impacts of climate change on the United States. The report emerges at a convenient time, with climate change legislation currently making its way through Congress. Having been requested by the Chairman of the Senate Committee on Energy and Natural Resources, the report seems clearly designed to be a piece of political ammunition. Although as is customary with CBO reports, it stops short of specific recommendations, it does give some pages to discussing the implications of different energy and emissions futures for climate impacts. Yet the report is rather quiet on the issue of adaptation, stating only that it will be required for some sectors.