lusions seem highly likely: first, that the utility sector, which accounts for more than one-third of U.S. greenhouse gas emissions, will be covered, and second, that the emissions reductions that ultimately will be required are likely to be at least 50% by comparison with 1990 levels. When these assumptions are evaluated against the projection of the Energy Information Administration (EIA) that electricity use will increase 30% between now and 2030 and against recent reports that CO2 emissions from power plants rose 2.9% in 2007 (the bigg