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Previous Work

Below is a range of our past Environmental Performance Measurement work. The Environmental Sustainability Index (ESI), the predecessor to the Environmental Performance Index (EPI), ranked countries on 76 different elements of environmental sustainability, including natural resource endowments, past and present pollution levels, environmental management efforts, contributions to the protection of the global commons, and a society’s capacity to improve environmental performance over time. The EPI shifted focus to more straightforward measures of environmental performance. Due to changes in structures, data, and methodologies, rankings among iterations of the EPI are not strictly comparable in that a particular standing in one year and another ranking in a subsequent edition do not indicate a change in performance.

2012 Environmental Performance Index (EPI) 

2012 EPI Summary for Policymakers
2012 EPI Report
2012 EPI Appendix 1 -- Indicator Profiles
2012 EPI Appendix 2 -- Sensitivity Analysis
2012 EPI Appendix 3 -- Methods
2012 EPI Indicator Data (partly processed)
2012 EPI Raw Data (unprocessed)
2012 EPI Data Files (user-friendly excel)



2010 Environmental Performance Index (EPI)

2010 EPI Summary for Policymakers
2010 EPI Report
2010 EPI Country Profiles
2010 EPI Metadata
2010 EPI Data (excel)




2008 Environmental Performance Index (EPI)

2008 EPI Summary for Policymakers
2008 EPI Report
2008 EPI Metadata
2008 EPI Data
2008 EPI Data (All Countries Considered for Inclusion)





2006 Pilot Environmental Performance Index (EPI)

2006 Pilot EPI Summary for Policymakers

2006 Pilot EPI Report
2006 Pilot EPI Data
2006 Pilot EPI Data (All Countries Considered for Inclusion)





2005 Environmental Sustainability Index

2005 ESI Summary for Policymakers
2005 ESI Report
2005 ESI Data
2005 ESI Data (All Countries Considered for Inclusion)





2002 Environmental Sustainability Index

2002 ESI Report
2002 ESI Data

2001 Environmental Sustainability Index

2001 ESI Report
2001 ESI Presentation
2001 ESI Data

2000 Pilot Environmental Sustainability Index

2000 Pilot ESI Report
2000 Pilot ESI Presentation 

Other Environmental Performance Measurement Work

Toward a China Environmental Performance Index (2011)








Exploring Trade + the Environment: an Empirical Examination of Trade Openness and National Environmental Performance (2010)








The Environmental Performance Index (EPI) is constructed through the calculation and aggregation of 20 indicators reflecting national-level environmental data. These indicators are combined into nine issue categories, each of which fit under one of two overarching objectives. Click on "Learn More" to explore the complete methods.

Data Explorer

The EPI Data Explorer allows users to dynamically investigate global data: Compare environmental performance with GDP, population, land area, or other variables; create a chart that highlights all 178 ranked countries, only those in a specific region, or a custom-defined group. There's a lot more to the data than rankings, so dive in.