Chapter 8 discusses how national climate legislation is complemented by action at the regional, state and municipal level. The importance of sub-national actors is increasingly recognized in the international negotiations, and the Paris Agreement includes an explicit requirement to integrate climate policies across all levels of government. Responsibility for the implementation of national policies in key areas such as energy, transport and the environment is often devolved to the sub-national level. This gives cities and regions a formal role in national efforts to reduce emissions. Sub-national actors are also central to climate resilience. Adaptation to climate change is very context-specific and requires the close involvement of local stakeholders. The chapter documents how sub-national governments are often taking the lead in climate policy, assuming commitments that can exceed those made at national level. However, the coexistence of regional and national climate policies can create coordination problems and a high degree of collaboration among all levels of governance is essential.