(March 2018, 256 pages, 63.59 MB PDF.) This report by World Bank staff and a team of researchers at CIESIN, the City University of New York Institute for Demographic Research, and the Potsdam Institute for Climate Impact Research is the first to focus on longer-term climate impacts on crop and water resources and the ways in which they may influence internal migration. It employs a novel modeling framework that provides estimates not only of future numbers, but also likely hotspots of climate out-migration and in-migration in three regions: Mexico and Central America, East Africa, and South Asia. Unlike other recent efforts to model the impact of future climate change on population movements, this effort models across entire regions rather than at local or subnational levels. It is also based upon impacts on crop production and water resources, using model outputs from PIK’s ISIMIP project, rather than projected temperature and precipitation from global climate models.