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Local governments have emerged as important players in climate change governance, both at home and on the international stage. Likewise, action by states and provinces has been increasingly highlighted, particularly as national actors have moved slowly to reduce greenhouse gas emissions. But to what extent do local governments act independently from state and provincial governments in the area of climate change mitigation? Using an explicit process tracing approach, the article tests two hypotheses regarding the influence of upper level subnational governments on local policy. In Vancouver, British Columbia, Canada, a city that is a climate change leader, provincial government intervention cannot explain the results of climate change mitigation policy making. This suggests that local governments can exercise an important degree of autonomy over climate change policy, but also implies that where municipalities are less independently committed to climate action, active upper level government intervention will likely be needed.