World Environment Day (WED) is a day that stimulates awareness of the environment and enhances political attention and public action. It is on 5 June. It was the day that United Nations Conference on the Human Environment began. The United Nations Conference on the Human Environment was from 5-16 June 1972. It was established by the United Nations General Assembly in 1972. The first World Environment Day was on1973. World Environment Day is hosted every year by a different city with a different theme and is commemorated with an international exposition in the week of 5 June. World Environment Day is in summer in the Northern Hemisphere and winter in the Southern Hemisphere.