This Web site comes from the World Resources Institute, "an environmental think tank that goes beyond research to find practical ways to protect the earth and improve people's lives." The site contains a map of the relative contribution of carbon dioxide emissions of different geographic areas, and is offered as part of WRI's Global Topics: Climate Change and Energy. The map, which depicts emissions from 1900-99 to reflect the estimated residence time of CO2 in the atmosphere, can be downloaded. The site also includes a table of the top CO2-producing countries and links to the data sources used to create the map.