The need to decrease concentrations of carbon dioxide and other greenhouse gases (GHGs) in Earth's atmosphere has been identified as one of the most pressing modern-day environmental issues. Agriculture, in addition to being affected by the climate, contributes to climate change through its exchanges of GHGs with the atmosphere. This report provides up-to-date information on the science of carbon sequestration and GHG mitigation for various sectors of U.S. agriculture, including logistical and economic considerations for implementing practices designed to decrease GHG emissions from agriculture. The report draws on elements of the related 2004 CAST Task Force Report, Climate Change and Greenhouse Gas Mitigation: Challenges and Opportunities for Agriculture. Cochairs: Ron Follett, USDA-ARS-NPA; Sian Mooney, Boise State University; Jack Morgan, USDA-ARS-NPA; Keith Paustian, Colorado State University. R142, October 2011, ISBN 978-1-887383-33-2, 106 pp., $50.00; Interpretive Summary, 2 pp., free.  Quantity Discounts: Discounts are offered for purchases of 6+ copies of the same publication sent to a single address. Orders of 6 through 99 copies are discounted 25% from listed prices. Orders of 100 or more copies are discounted 35%.  Please contact the CAST office to place a discounted order.