Book excerpt: The New Urban Agenda (NUA), adopted in 2016 at the United Nations Conference on Housing and Sustainable Urban Development (Habitat III) in Quito, Ecuador, represents a globally shared understanding of the vital link between urbanization and a sustainable future. At the heart of this new vision stand a myriad of legal challenges – and opportunities – that must be confronted for the world to make good on the NUA’s promise. In response, this book, which complements and expands on the editors’ previous volumes on urban law in this series, offers a constructive and critical evaluation of the legal dimensions of the NUA. As the volume’s authors make clear, from natural disasters and resulting urban migration in Honshu and Tacloban, to innovative collaborative governance in Barcelona and Turin, to accessibility of public space for informal workers in New Delhi and Accra, and power scales among Brazil’s metropolitan regions, there is a deep urgency for thoughtful research to understand how law can be harnessed to advance the NUA’s global mission of sustainable urbanism. It thus creates a provocative and academic dialogue about the legal effects of the NUA, which will be of interest to academics and researchers with an interest in urban studies.