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United Nations Environment Programme ,  [A manual for water and waste management: what the tourism industry can do to improve its performance] ,  A manual for water and waste management: what the tourism industry can do to improve its performance

United Nations Environment Programme ,  World Business Council for Sustainable Development ,  [Industry, freshwater and sustainable development] ,  Industry, freshwater and sustainable development

United Nations Environment Programme ,  [Integrated assessment of black carbon and tropospheric ozone: summary for decision makers] ,  Integrated assessment of black carbon and tropospheric ozone: summary for decision makers