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World Environment Day is held each year on June 5. It is one of the principal vehicles through which the United Nations (UN) stimulates worldwide awareness of the environment and enhances political attention and action. 

World Environment Day is celebrated in many ways in countries such as Kenya, New Zealand, Poland, Spain and the United States. Activities include street rallies and parades, as well as concerts, tree planting, and clean-up campaigns. In many countries, this annual event is used to enhance political attention and action towards improving the environment. This observance also provides an opportunity to sign or ratify international environmental conventions.

World Environment Day was established by the United Nations General Assembly in 1972 to mark the opening of the Stockholm Conference on the Human Environment. Another resolution, adopted by the General Assembly the same day, led to the creation of UNEP. It is hosted every year by a different city and commemorated with an international exposition through the week of June 5.

The main colors featured in many promotions for this event are natural colors depicting nature, the earth and its natural resources. These colors are often softer shades of green, brown and blue. Snowy mountains, clean beaches, unpolluted rivers, and photos of natural flora and fauna, including fern leaves, are used to promote campaigns supporting the day.