Climate stress is likely to add to existing migration patterns in developing countries and beyond but is not expected to generate entirely new flows of people. A report by the World Bank in 2018 estimated that around 143 million people in three regions (Sub-Saharan Africa, South Asia, and Latin America) could be forced to move within their own countries to escape the slow-onset impacts of climate change. They will migrate from less viable areas with lower water availability and crop productivity and from areas affected by rising sea level and storm surges.