The impact of climate change on migration has gained both academic and public interest in recent years. Here we employ a meta-analysis approach to synthesize the evidence from 30 country-level studies which estimate the effect of slow and rapid-onset events on migration worldwide. Most studies find that environmental hazards affect migration, although with contextual variation. Migration is primarily internal or to low-and middle-income countries. The strongest relationship is found in studies with a large share of non-OECD countries, particularly from Latin America and the Caribbean and Sub-Saharan Africa, and in studies of middle-income and agriculturally dependent countries. Income and conflict moderate and partly explain the relationship between environmental change and migration. Combining our estimates for differential migration responses with the observed environmental change in these countries during the past decades illustrates how the meta-analytic results can provide useful insights for the identification of potential hotspots of environmental migration.

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