Ceinture verte (urbanisme)

A green belt is a policy and land-use zone designation used in land-use planning to retain areas of largely undeveloped, wild, or agricultural land surrounding or neighboring urban areas. Similar concepts are greenways or green wedges, which have a linear character and may run through an urban area instead of around it. In essence, a green belt is an invisible line designating a border around a certain area, preventing development of the area and allowing wildlife to return and be established. In those countries which have them, the stated objectives of green belt policy are to: Protect natural or semi-natural environment s; Improve air quality within urban areas; Ensure that urban dwellers have access to the countryside, with consequent educational and recreational opportunities; Protect the unique character of rural communities that might otherwise be absorbed by expanding suburbs. The green belt has many benefits for people: Walking, camping, and biking areas close to the cities and towns. Contiguous habitat network for wild plants, animals and wildlife. Cleaner air and water Better land use of areas within the bordering cities. The effectiveness of green belts differs depending on location and country. They can often be eroded by urban rural fringe uses and sometimes, development 'jumps' over the green belt area, resulting in the creation of "satellite towns" which, although separated from the city by the green belt, function more like suburbs than independent communities. In the 7th century, Muhammad established a green belt around Medina. He did this by prohibiting any further removal of trees in a 12-mile-long strip around the city. In 1580 Elizabeth I of England banned new buildings in a 3-mile wide belt around the City of London in an attempt to stop the spread of plague. However, this was not widely enforced and it was possible to buy dispensations which reduced the effectiveness of the proclamation. In modern times, the term emerged from continental Europe where broad boulevards were increasingly used to separate new development from the center of historic towns; most notably the Ringstraße in Vienna.