Soil carbon sequestration has emerged as a near-term option for mitigating greenhouse gas emissions; however, current methods for measuring and monitoring actual changes in soil carbon are labor and time intensive. With support from USAID, JGCRI and partners from Brookhaven National Laboratory (BNL), Los Alamos National Laboratory (LANL), USDA-Beltsville Agricultural Research Center, and Kansas State University recently tested under field conditions the accuracy, comparability, and feasibility of standard and advanced technologies to measure soil carbon. In addition to the standard technology, dry combustion, three advanced technologies were tested: Inelastic Neutron Scattering (INS), Laser Induced Breakdown Spectroscopy (LIBS), and Mid-Infrared Spectroscopy (MIR). Further field tests will be conducted in Mexico early in 2007. For more information, contact César Izaurralde at JGCRI.