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World Environment Day (WED) was established by the United Nations General Assembly in 1972. WED is hosted every year by a different city and commemorated with an international exposition through the week of June 5. The United Nations Environment Programme (UNEP), also created in 1972, uses WED to stimulate awareness of the environment and enhance political attention and public action.
"Stockholm was without 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."

WED 2007
The topic for World Environment Day for 2007 was "Melting Ice – a Hot Topic?" During International Polar Year, WED 2007

World Environment Day Logo for 2007.
focuses on the effects that climate change is having on polar ecosystems and communities, on other ice- and snow-covered areas of the world, and the resulting global impacts.
The main international celebrations of the WED 2007 were held in the city of Tromsø, Norway, a city north of the Arctic Circle self-styled as "The Gateway to the Arctic".[1]
The UNEP statement on WED 2007 states:
The day's agenda is to give a human face to environmental issues; empower people to become active agents of sustainable and equitable development; promote an understanding that communities are pivotal to changing attitudes towards environmental issues; and advocate partnership, which will ensure all nations and peoples enjoy a safer and more prosperous future. World Environment Day is a people's event with colourful activities such as street rallies, bicycle parades, green concerts, essays and poster competitions in schools, tree planting, as well as recycling and clean-up campaigns.