The need to decrease concentrations of carbon dioxide and other greenhouse gases (GHGs) in Earth's atmosphere is one of the most pressing environmental issues. Agriculture both contributes to and is affected by climate change through its exchanges of GHGs. This report provides current information on carbon sequestration and GHG mitigation for various sectors of U.S. agriculture, including logistical and economic considerations for implementing emissions-reduction practices. It builds on the related 2004 CAST Task Force Report on climate change and greenhouse gas mitigation in agriculture.