Cities represent an increasingly powerful force in global politics – but they're still constrained by the agendas of slow-acting states.
It's a good thing that cities aspire to lead the way in acting on climate change in the absence of stronger national action. But a closer look reveals the limitations of current city-based efforts.
As the US leaves the Paris accord, how much faith should we put in international treaties? States, cities and local movements are increasingly important players in the fight against climate change.