CIESIN developed a data set of country-level population and Gross Domestic Product (GDP) and corresponding geospatial data products (downscaled grids) for selected years. The methodology used was simple linear downscaling from regions of Intergovernmental Panel on Climate Change (IPCC) Special Report on Emissions Scenarios (SRES) models to all countries. The downscaled population and GDP data represented an initial effort to meet the urgent needs of impacts researchers for country-level data. This work was the first exercise of its kind in downscaling socioeconomic drivers. It was based on the SRES scenarios but produced independently of the SRES report.