This report provides a synthesis of the work in the second year of the "China-US Deep DecarbonizatiorTechnology Innovation and Policy" project. It summarizes the research findings of the 2022-2023 academic workshops on key decarbonization technologies, which focused on building heating; green hydrogen; carbon capture, utilization, and storage (CCUS); and hard-to-abate transportation modes. As summarizec here, the work of the three teams separately and in the joint seminars provided up-to-date assessments on the status of these key technologies in both countries, including their current and proiected costs and possible policies for accelerating progress toward widespread implementation.