Climate and migration in the United States
利用人口普查和税务申报的长期数据，研究发现美国温暖气温导致净人口迁出，而凉爽气温则无此效应；移民是对高温的中期反应，且舒适度价值是重要机制。
We study whether households engage in climate-related migration in the United States, a country where most of the population does not regularly experience natural disasters or work in climate-exposed industries. With comprehensive, long-run data from both the Census and tax filings, we document that warm temperatures induce net out-migration, while cooler temperatures do not. By comparing estimates from models using different lengths of temporal variation, we further show that migration is a medium-run response to high temperatures: decadal and longer shifts in weather have larger annualized impacts than year-over-year changes. Finally, comparisons across county types suggest amenity value is an important mechanism behind climate-related migration in the United States.