Since the 1990s ‚beliefs‘, ‚ideas‘ or ‚knowledge‘ as well as processes of communicative interactions such as persuasion, argumentation and learning have received increasing attention in social science for the understanding of political changes. This book makes a significant contribution to this scholarly debate and will be of interest to practitioners, showing on one side how climate change has received more and more attention in policy making at the local level and changed the urban agenda and on the other how different the responses of cities to this global challenge are – and how these differences between cities can be explained. This book was previously published as a special issue of Urban Research and Practice.