Climate instability, urbanization and international migration

This paper focuses on climate-induced migration. We construct a simple theoretical model where, in a first step, climate shocks accelerate the transition from the traditional to the modern sector, leading rural workers to move to urban centres within national borders, while in a second step, downward pressures on wages due to the greater labour supply in cities push people to engage in international migration. To test this hypothesis, we exploit a rich panel dataset, displaying a representative picture of bilateral migration flows and climatic data across 222 countries for the period 1960–2000. Findings suggest that in the next few years the climate-induced growth rate of migrant stocks might be in a range between 8.6 per cent and 12.8 per cent, especially from developing countries, where the level of rural employment is more likely to be affected by climatic shocks.