This paper draws on case studies in Mali, Nigeria, Tanzania and Vietnam to explore the different ways in which migration intersects with the changing relations between rural and urban areas and activities, and in the process transforms livelihoods and the relations between young and older men and women. Livelihood strategies are becoming increasingly diverse, and during interviews people were asked to describe their first, second and third occupations, the time allocated to each and the income that each produced. In all study regions, the number of young people migrating is increasing.

The impacts of climate change are likely to affect population distribution and mobility. While alarmist predictions of massive flows of refugees are not supported by past experiences of responses to droughts and extreme weather events, predictions for future migration flows are tentative at best.