Migration in response to climate change is a big topic in the media. But the focus is all too often on either international cross-boundary movements or short-term population displacement from major floods or droughts. While these forms of population movement are important, they are by no means the whole story. A new report by World Bank, CIESIN, CUNY, and PIK, Groundswell: Preparing for Internal Climate Migration, 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.