section 1. Agricultural research for a carbon-constrained world -- section 2. Agricultural management and soil carbon dynamics -- section 3. Agricultural management and greenhouse gas flux -- section 4. Modeling to estimate soil carbon dynamics and greenhouse gas flux from agricultural production systems -- section 5. Measurements and monitoring : improving estimates of soil carbon dynamics and greenhouse gas flux -- section 6. Economic and policy considerations associated with reducing net greenhouse gas emissions from agriculture -- section 7. Looking ahead : opportunities for future research and collaboration.