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United Nations Environment Programme ,  World Meteorological Organization ,  National Oceanic and Atmospheric Administration ,  National Aeronautics and Space Administration ,  European Commission ,  [Twenty Questions and Answers About the Ozone Layer: 2014 Update - Scientific Assessment of Ozone Depletion: 2014] ,  Twenty Questions and Answers About the Ozone Layer: 2014 Update - Scientific Assessment of Ozone Depletion: 2014