World Environment Day ('WED') is celebrated every year on June 5 to raise global awareness to take positive environmental action to protect nature and the planet Earth. It is run by the United Nations Environment Programme (UNEP). It was established by the United Nations General Assembly in 1972 on the day that United Nations Conference on the Human Environment began. The first World Environment Day was celebrated in 1973. Since then it is hosted every year by a different city with a different theme. World Environment Day falls in spring in the Northern Hemisphere and fall in the Southern Hemisphere, and midsummer in the Tropical regions. "Stockholm was without a doubt the landmark event in the growth of international environmentalism", writes John McCormick in the book Reclaiming Paradise. "It was the first occasion on which the political, social and economic problems of the global environment were discussed at an intergovernmental forum with a view to actually taking corrective action."