Abstract Optimism about the contribution of city policies worldwide to reduce greenhouse gas emissions is widespread. It is based, though, on partial and anecdotal studies rather than comprehensive system-wide estimates. Popular empirical indicators to support the importance of cities, such as consumption-based emissions within city borders, lack a policy connection. Here I undertake an initial assessment of the effectiveness of emissions reduction through urban climate policies. It employs a novel decomposition of effectiveness into reach, capability and stringency. This results in a qualitative estimation of current and maximum contributions of city climate policies – divided into four types – to global emissions reduction. I formalize the framework to numerically illustrate additional policy aspects. Based on the insights obtained, I suggest policy and political strategies to make better use of cities’ competences to mitigate climate change.

中文翻译：

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全球城市气候政策的系统评估：将有效性分解为 3 个因素

摘要 对全球城市政策对减少温室气体排放的贡献普遍持乐观态度。然而，它基于部分和轶事研究，而不是全面的全系统估计。支持城市重要性的流行实证指标，例如城市边界内基于消费的排放，缺乏政策联系。在这里，我对通过城市气候政策减排的有效性进行了初步评估。它采用了将有效性分解为范围、能力和严格性的新方法。这导致对城市气候政策（分为四种类型）对全球减排的当前和最大贡献进行定性估计。我将框架形式化，以数字方式说明其他政策方面。根据获得的见解，