Aligning subnational climate actions for the new post-Paris climate regime

The Paris Agreement solidified the participation of subnational governments in global mitigation efforts, continuing the shift towards a polycentric landscape of climate action. Many scholars have suggested that the success of this emergent regime will depend, at least in part, on its ability to integrate climate action from non-state and subnational entities. Vertical alignment, the linking and coordination of policies between different levels of government, and horizontal alignment, the connection of peer cities and regions through networks of transnational climate governance, can help facilitate needed coherence. But, how do multiple actors link or interact at multiple scales and domains? In this article, we develop an analytical framework for examining different modes of vertical and horizontal alignment that subnational actors have employed to address climate change mitigation. We identify key elements in nine case studies of subnational climate action to examine the intersectionalities of alignment mechanisms that catalyze subnational climate actions. The paper concludes with a discussion about how vertical and horizontal alignment pathways overlap, intersect, and exhibit trade-offs.