How can cities achieve accelerated systemic decarbonization? Analysis of six frontrunner cities

Globally, many cities have pledged to reach net zero emissions by mid-century and formulated climate action plans (CAPs) to pursue this goal. Attainment of net zero requires accelerated systemic decarbonization measures to catalyze fundamental changes across multiple societal systems simultaneously. Yet the extant literature has not conceptually clarified conditions leading to accelerated systemic decarbonization in cities. This research therefore aims to: (1) conceptualize strategies that contribute to accelerated systemic decarbonization at the sub-national level and develop a framework for empirically identifying these; and (2) assess the extent to which CAPs in cities known for progressive climate policies embody these characteristics. This involved examination of evidence from CAPs and related documents in six cities: Copenhagen, Leeds, Oslo, San Francisco, Australian Capital Territory and Kyoto. Findings show that San Francisco's climate actions are the most indicative of accelerated systemic decarbonization. In other cities, although many ingredients for accelerated systemic decarbonization are in place, several missed opportunities to achieve more rapid and transformative decarbonization outcomes were identified. These include lack of consideration of scope 3 emissions and limited participatory governance measures as well as absence of economic planning, climate budgets and financial indicators to estimate the benefits or costs of various climate-mitigation actions.