Consortium members at Colorado State University are leaders in measuring and modeling soil carbon and evaluating the impacts of agricultural management on carbon sequestration. CSU researchers have served as Lead Authors on current and previous Intergovernmental Panel on Climate Change (IPCC) assessment reports and have led the development of the soils components of the IPCC Guidelines for National Greenhouse Gas Inventories. They are the developers of the Century ecosystem model, which is one of the most widely used model of soil carbon and nutrient cycling, world-wide. Previous and ongoing research activities include basic studies of soil organic matter formation and cycling, analysis of soil carbon changes with different agricultural practices, field measurement and modeling of CO2, N2O and CH4 flux from soils, and modeling of soil carbon dynamics in agricultural, grassland and forest systems. They are collaborating on soil carbon research and modeling in Canada and in developing countries. They are collaborating in combining economic models with ecosystem and soil carbon models to produce economic and environmental assessments of soil carbon sequestration potential. Research is being conducted in close collaboration with several Federal Agencies, including USDA’s Natural Resource Conservation Service (NRCS), Agricultural Research Service (ARS), Economic Research Service (ERS) and the Department of Energy (DOE) and the Environmental Protection Agency (EPA).