Global 15 x 15 Minute Grids of the Downscaled GDP Based on the SRES B2 Scenario, 1990 and 2025 beta version, was developed at CIESIN, Columbia University, by Stuart R. Gaffin, Xiaoshi Xing, and Greg Yetman. Nebosja Nakicenovic, Arnulf GrĂ¼bler, R. Alexander Roehrl and Keywan Riahi, at the International Institute for Applied Systems Analysis (IIASA) provided unpublished regional SRES economic growth rate data for MESSAGE model, B2 scenario. This work, including access to the data and technical assistance, is provided by CIESIN, with funding from the National Aeronautics and Space Administration under Contract NAS5-98162 for the Operation and Maintenance of the Socioeconomic Data and Applications Center (SEDAC).