This report debunks arguments about the difficulty and costs of compliance with the Kyoto Protocol. Tellus Institute and the Union of Concerned Scientists surveyed and compared a series of studies from the past ten years that examine the future prospects for energy-efficient and low-carbon fuel technologies. According to such studies, great technological potential exists for the United States to significantly reduce its carbon dioxide emissions. In many cases, the resulting savings on energy bills from the use of more efficient measures would outweigh the cost of implementing those measures. Moreover, the same measures that would reduce carbon dioxide emissions would also yield other significant environmental and public health benefits.