Exploring Sustainable Solutions for Increasing Global Food Supplies summarizes the second of two National Research Council workshops, addressing the sustainability challenges associated with food security for all. The workshop was held in May 2011. While sustainable food security depends both on the availability of food supplies and assuring access to food, this workshop focused specifically on assuring the availability of adequate food supplies. How can food production be increased to meet the needs of a population expected to reach over 9 billion by 2050? Workshop objectives included identifying the major challenges and opportunities associated with achieving sustainable food security and identifying needed policy, science, and governance interventions. Workshop participants discussed long term natural resource constraints, specifically water, land and forests, soils, biodiversity and fisheries. They also examined the role of knowledge, technology, modern production practices, and infrastructure in supporting expanded agricultural production and the significant risks to future productivity posed by climate change.