The G-Econ research project is devoted to developing a geophysically based data set on economic activity for the world. The current data set (GEcon 1.3) is now publicly available and covers "gross cell product" for all regions for 1990, which includes 27,500 terrestrial observations. The basic metric is the regional equivalent of gross domestic product. Gross cell product (GCP) is measured at a 1-degree longitude by 1-degree latitude resolution at a global scale. Updates will be posted as they become available. The project director is Professor William Nordhaus, Yale University. Email contact at william.nordhaus@yale.edu.