This book explores the social, economic and environmental forces that may combine to attract migrants of various types and backgrounds to OECD countries, as well as those that may persuade migrants to leave their countries or to stay at home. By analysing different pull and push factors and constructing five different scenarios of migration in the future, this volume casts light on major determinants of global migration flows, which OECD countries will look particularly attractive for migrants, where the pressures to migrate be especially strong and what kind of migration-related issues will policy makers likely be facing as 2030 approaches.