Abstract. The papers in this theme issue seek to advance our understanding of the roles of networks and partnerships in the multilevel governance of climate change and related issues in the urban context. In particular, the papers examine the roles of nontraditional actors and apply emerging theoretical approaches such as sustainability transitions theory to gain a greater understanding of the variety of approaches being employed around the world, as well as the transformative potential of these approaches. We discuss the role of the state relative to the roles of local leadership, knowledge systems, and community-wide collaborative engagement in bringing about sustainability transitions.