After long nights, intense negotiating, and ultimately the most important international climate deal in history, it’s time to get to work. Home to the majority of the world’s population, and with about 1/3 of the carbon budget to stay under 2 degrees, cities have a big role to play. But how will they achieve this? Next City provides a review of key issues and opportunities for resilience, economies of scale, financing, cooperation among multiple levels of government and with the private sector. There’s a great deal of work that needs to be done for cities to fulfill their role in CO2 reductions, as well as in climate adaptation. Climate change presents serious risks to many cities, but for the committed and creative, also presents opportunities to build cities better.