In the U.S., the agriculture and forestry sectors account for 6%-8% of current estimated total U.S. greenhouse gas emissions annually. Combined, these sectors are estimated to emit more than 500 million metric tons CO2 equivalent (MMT CO2-Eq.) each year, most of which is emitted from the agriculture sector. Contents of this report: (1) Intro.; (2) Estimated Current Emissions and Sequestration; (3) Estimated Additional Potential Mitigation; (4) Limitations of Mitigation Potential Estimates; (5) Changes to EPA¿s Simulation Models and Results: Comparison of EPA¿s 2005 and 2009 Modeling Results; Differing Baseline Assumptions for Agriculture Soil Activities; (6) Considerations for Congress. Charts and tables.