Number: RL34436 Title: The Role of Offsets in a Greenhouse Gas Emissions Cap-and-Trade Program: Potential Benefits and Concerns Authors: Jonathan L. Ramseur, Resources, Science, and Industry Division Abstract: The first section of this report provides an overview of offsets by discussing different types of offset projects and describing how the offsets would likely be used in an emission reduction program. The next section discusses the supply of offsets that might be available in an emission trading program. The subsequent sections examine the potential offset benefits and the potential concerns associated with offsets. The final section offers considerations for Congress. In addition, the report includes a table comparing the role of offsets in selected emission reduction programs: proposals in the 110th Congress, U.S. state initiatives, and international programs. Pages: 31 Date: September 22, 2008