United Nations Environment Organization Foundation Day
United Nations Environment Organization Foundation Day is held on December 15. This event in the second decade of the month December is annual. 
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As a member of the United Nations Development Group, UNEP aims to help the world meet the 17 Sustainable Development Goals.
Similar holidays and events, festivals and interesting facts
International Monkey Day on December 14 (The unofficial international holiday was created by artists Casey Gore and Eric Millikin to spread knowledge about animals and to show them care and love);
National Energy Conservation Day in India on December 14 (since 1991);
World Energy Conservation Day on December 14
UN Arabic Language Day on December 18 (Established by the UN decision to include Arabic among the official and working languages of the General Assembly and its Main Committees);
Supply Day on December 19
Look for an Evergreen Day on December 19
Wren Day in Ireland and the Isle of Man on December 26