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In the United States, the federal government plays a critical role in the development of national climate and energy policy. At this point, however, with the failure of Congress to pass comprehensive climate and clean energy legislation, the United States has not yet adopted comprehensive federal policies to achieve the low-carbon technology development and greenhouse gas (GHG) emission reductions required to address the threat of dangerous climate change. Specific federal actions over the past several years, though, have achieved some progress in slowing the growth of GHG emissions and in developing low-carbon technologies. To build upon present and past efforts, federal policymakers have a wide array of policy options, each of which can help the country make progress toward achieving emission reduction goals and together can put the country on the path toward a lower-carbon future.