CO2 is the largest driver of climate change and the greenhouse gas most intimately integrated into the U.S. economy and way of life. This ad hoc committee will examine the status of technologies, policies, and societal factors needed for decarbonization and recommend research and policy needs, focused on the near and midterm (5-20 years). Specific questions that will be addressed by the committee include sectoral interactions and systems impacts; technology research, development, and deployment at scale; social, institutional, and behavioral dimensions, particularly equity; and policy coordination and sequencing at local, state, and federal levels.