As climate change unfolds, formal planning for climate adaptation is emerging at all levels of governments. This paper examines the factors that lead U.S. state governments to develop comprehensive adaptation plans. Using an event history analysis, we find that a state is more likely to engage in adaptation planning we find that a state is more likely to engage in adaptation planning when it experienced more extreme weather events recently, has more economic activities in coastal regions, or when it has high levels of incomes and civic engagement. We also show that political ideology plays a critical role in subnational adaptation decision making. A state is less likely to pursue adaptation planning when it has a Republican governor or has a lack of preference for environmental legislations. In addition to the internal characteristics, our study further provides evidence of the external influence from other nearby adapting states through spatial policy diffusion. These findings shed light on the motivation for and obstacles to a state's adoption of adaptation policy and also provide implications for environmental federalism.

中文翻译：

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影响政府适应气候变化计划的因素：美国各州的证据

随着气候变化的发展，各级政府都在制定气候适应的正式计划。本文研究了导致美国各州政府制定全面适应计划的因素。使用事件历史分析，我们发现某州更有可能参与适应计划，而当某州最近经历了更多极端天气事件，在沿海地区开展更多经济活动或当它具有高收入和公民参与度时。我们还表明，政治意识形态在地方适应决策中起着至关重要的作用。当州有共和党州长或对环境立法不偏爱时，就不太可能进行适应计划。除了内部特征 我们的研究进一步通过空间政策扩散提供了其他附近适应国家的外部影响的证据。这些发现揭示了一个州采用适应政策的动机和障碍，也为环境联邦制提供了启示。