This Web site provides access to the 2005 Environmental Sustainability Index (ESI) report and underlying data , and the map gallery . In addition, it provides an archive of the reports and data for the 2000, 2001, and 2002 versions of the ESI. The documents made available here provide in-depth details on the analytical framework, quantitative methodology, and data sources that underlie each edition of the ESI. Note that because of data and methodological improvements to each subsequent version of the ESI, the country scores cannot be utilized in time-series analysis. We welcome criticisms, suggestions, and comments.