World Environment Day is celebrated annually on 5 June for encouraging awareness and action for the protection of the environment. Since its beginning in 1974, World Environment Day has developed into a global platform for raising awareness and taking action on urgent issues like marine pollution, global warming etc.
About World Environment Day
The UN General Assembly designates 5th June 1972 as World Environment Day, marking the first day of the Stockholm Conference on the Human Environment.
Sources : Worldenvironmentday