The Environmental Performance Index (EPI) is a research project aiming at establishing an international composite environment index. It is jointly implemented by two US-Universities (Yale/New Haven and Columbia/New York) and has been commissioned by the World Economic Forum/Davos. The research project attempts to facilitate quantitative cross-country comparison of the environmental performance of countries with the objective of enhancing conditions of success for environmental policies. It further strives to complement the environment indicator set of the United Nations Millennium Development Goals.