Since 2010, a total of eighty-one cities and six provinces have been designated as low-carbon pilots in China. Five years later, the Alliance of Peaking Pioneer Cities was established at the US-China Climate-Smart/Low-Carbon Cities Summit, bringing together 15 low-carbon pilots committed to achieving a carbon peak by or before 2020. These low-carbon pilots have produced a large amount of data and will continue to be important laboratories for China’s low-carbon actions at the subnational level. iGDP evaluates the low-carbon performance of China’s cities, tracks and maintains a database of low-carbon case studies, and performs research on China’s peaking and net-zero efforts at the subnational level. We organize workshops and training programs on low-carbon city planning and have partnered with the World Bank, GIZ, World Wildlife Fund, C40, Lawrence Berkeley National Laboratory, and UNESCAP’s North East Asia Low Carbon City Platform on a variety of projects.