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We show that exposure to extreme temperatures significantly increases international migration from El Salvador, where nearly a quarter of the population lives in the United States. Extreme temperatures
reduce corn yields, leading producers to decrease their use of post-harvest inputs and demand for agricultural workers. These income losses, combined with established U.S. migration networks,
increase emigration. Our findings highlight how international migration serves as a response to extreme temperatures when destination networks are strong and migration remains financially
feasible. This pattern is not unique to El Salvador: roughly 30 million farms globally are in low-income settings with access to remittances.
