Nearly half of humanity currently lives in cities. By the middle of the century, it will be at least two-thirds. Global urbanization presents great challenges for sustainable development, but also offers great opportunities for a better future for humanity. The “Co-producing sustainable cities?” conference will take the Habitat III conference as an opportunity to discuss the conditions that sustainable urban development requires: Will the right to housing be recognized internationally as a human right? How can cities ensure the availability of adequate and affordable housing for all? What can they do against traffic gridlock and air pollution? How will secure and universally affordable urban mobility be organized? How do you turn mountains of waste into a closed-loop economy that conserves resources while also guaranteeing a livelihood to the poor, and women in particular? Representatives of city governments and civil society from the global South and North will be discussing these issues.