In  March 2022, Which of the following organization has completed 50 years ?

The  United Nations Environment Programme  ( UNEP ) is responsible for coordinating responses to environmental issues within the United Nations system. [1] [2]  It was established by  Maurice Strong , its first director, after the  United Nations Conference on the Human Environment  in Stockholm in June 1972. Its mandate is to provide leadership, deliver science and develop solutions on a wide range of issues, including climate change, [3]  the management of marine and terrestrial  ecosystems , and green economic development. [4]  The organization also develops  international environmental agreements ; publishes and promotes  environmental science  and helps national governments achieve environmental targets.