Global determinants of coastal migration under climate change

International audience Climate change-induced sea-level rise and associated flood riskwill havemajor impacts on coastal regions worldwide, likely prompting millions of people tomigrate elsewhere. Migration behavior is expected to be context-specific, but comparative empirical research on coastal migration under climate change islacking. We address this gap by utilizing original survey data from coastal Argentina, France, Mozambique and the United States to research determinantsof migration under different flood risk scenarios. Here we show that migration is more likely in higher-than in lower-income contexts, and thatflood risk is an important driver of migration. Consistent determinants of migration across contexts include response efficacy, self-efficacy, placeattachment and age, with variations between scenarios. Other factors such as climate change perceptions, migration costs, social networks, householdincome, and rurality are also important but context-specific. Furthermore, important trade-offs exist between migration and in-situ adaptation. Thesefindings support policymakers in forging equitable migration pathways under climate change.