The Technical Working Group on Agricultural Greenhouse Gases published a 2011 report, Assessing Greenhouse Gas Mitigation Opportunities and Implementation Strategies for Agricultural Land Management in the United States, which reviews a wide range of agricultural practices for principal cropping systems in the United States. It provides a roadmap and resource for programs and initiatives that are designing protocols, metrics, or incentives to engage farmers and ranchers in large-scale efforts to enhance GHG mitigation on working agricultural land in the United States. A 2011 appendix to that report focuses on technical comparisons. The appendix, Greenhouse Gas Mitigation Potential of Agricultural Land Management: A Synthesis of the Literature, provides a side-by-side comparison of the GHG mitigation potential of 42 agricultural land management activities in the United States.