(October 2011, 129 pages, 4.93 MB PDF.) A new report released by the United Kingdom’s Foresight Project on Environmental Migration examines potential migration patterns and the possible challenges and opportunities this will present in the future. As a contribution to this report, CIESIN completed a modeling effort on net migration by ecosystem and by decade for the past 40 years. Because of the lack of globally consistent data on migration, indirect estimation methods were used.