World Environment Day
Humankind has not woven the web of life...
Date: June, 5th.
Observed: all U.N. members states.
Origin: United Nations General Assembly in 1972.
Purpose: create awareness for environmental problems and serves as the ‘people’s day’ for doing something positive for the environment.
Reference:
http://www.earthday.org/about/the-history-of-earth-day/