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In page UNECE Environmental Performance Reviews:

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The UNECE Programme on EPRs was inspired by a sister programme launched by the Organisation for Economic Co-operation and Development (OECD) for its member States in 1991. In 1993 at the second "Environment for Europe" Ministerial Conference in Lucerne, Switzerland, UNECE was asked to run an EPR Programme for its member States that were not covered by the OECD EPR Programme.[1] Therefore, the UNECE EPRs focus on the countries of Eastern Europe, Caucasus, Central Asia and South-Eastern Europe known as economies in transition.[citation needed]