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February 2014
United Nations Economic Commission for Europe (UNECE), United Nations Environment Programme (UN Environment), Food and Agriculture Organization of the United Nations (FAO)

Payments for Ecosystem Services (PES) describes the situation where the user of an environmental service, such as water purification, pays the landowners who provide that service.

June 2012
United Nations Environment Programme (UN Environment)

The cities of the 21st century are the largest sites of human settlement today and are increasingly acting as critical nexus points of social, economic, ecological and technological change.