【主题】Agricultural income shocks drive drought induced migration from Mexico to the US
【Abstract】There is now substantial empirical evidence that climatic variability increases international migration, but relatively little is known about the mechanism driving the relationship and about adaptations that may reduce it. We use detailed data on migrants from Mexico to the U.S. to show that drought induced migration from Mexico to the U.S. is mediated by agricultural income shocks. We show that migration rates increase in drought years, but only in those parts of Mexico in which agriculture is sensitive to drought, and only by farmers whose lands are unirrigated and do not have non-agricultural sources of income. The results suggest that an expansion of irrigation and income diversification can avert the effect of climate change on future migration.