What's English for Social Engineering?
Greenbelt 
"Green belt
From Wikipedia, the free encyclopedia.
For other uses, see Green belt (disambiguation).
A green belt or greenbelt is an area of largely undeveloped wild or agricultural land surrounding or neighbouring an urban area. A similar concept is the greenway which has a linear character and may run through the urban area instead of around it. The more general term in the U.S. is green space or greenspace, which may be a very small area such as a park.
In some countries, development in green belt areas is heavily restricted. Aims include:
protecting the natural environment;
improving air quality in urban areas;
ensuring that urban dwellers have easy access to the countryside, with consequent educational and recreational opportunities; and
protecting the unique character of rural communities which might otherwise be absorbed by expanding suburbs.
Sometimes, development jumps over the restricted greenbelt area, resulting in the creation of "satellite towns" which, although separated from the city by green space, function more like suburbs than independent communities.
The protection of green belts was pioneered in the United Kingdom, where there are fourteen green belt areas, covering 16,716 km², or 13% of England; for a detailed discussion of these, see Green Belt (UK). Another notable example is the Ottawa Greenbelt in Canada.
An act of the Swedish parliament from 1994 has declared a series of parks in Stockholm and the adjacent municipality of Solna to its north a "national city park" called Ekoparken (the "Eco park"; it stretches from the parks surrounding the royal palaces of Ulriksdal and Haga in Solna, through the Brunnsviken area, down to the former royal hunting grounds of North and South Djurgården)."
Yeah, sounds familiar from Frankfurt's Grüngürtel concept.
But maybe you're talking about one of those:
"Green belt (disambiguation)
From Wikipedia, the free encyclopedia.
A greenbelt or green belt is an undeveloped area neighbouring or surrounding an urban area, often protected from development by planning law. For a general treatment of these see green belt. Articles covering particular examples include:
Green Belt (UK)
Greenbelt (Ottawa)
Staten Island Greenbelt
Other uses of the word greenbelt include:
Greenbelt, Maryland - a town in the suburbs of Washington, D.C.
Greenbelt (Washington Metro) - a metro station in Greenbelt, Maryland
The Greenbelt festival - an annual Christian music festival in England
A rank of achievement (pupil grade) in multiple martial arts systems, most notably the basic forms of Karate and Judo.
A Six Sigma Green Belt is a certification level of the Six Sigma processes.
The Green Belt is one of the six marked routes of the Pittsburgh/Allegheny County Belt System.
This is a disambiguation page, a list of pages that otherwise might share the same title."
Following the Green Belt (UK) link gives you this:
"Green Belt (UK)
In UK city planning, the Green Belt is a concept for controlling metropolitan growth introduced around London, England by minister of housing Duncan Sandys via a Government Circular.
The idea is a ring of countryside where urbanisation will be resisted for the foreseeable future, maintaining an area where agriculture, forestry and outdoor leisure can be expected to prevail. The notion dated from Herbert Morrison's 1934 leadership of the London County Council and was included in an advisory Greater London Plan prepared by Patrick Abercrombie in 1944. However, it was some 14 years before the elected local authorities responsible for the area recommended had all defined the area on scaled maps with some precision.
As the outward growth of London was seen to be firmly repressed, residents owning properties further from the built-up area also campaigned for this policy of urban restraint, partly to safeguard their own investments but often invoking an idealised scenic/rustic argument which laid the blame for most social ills upon urban influences. In mid-1971, for example, the government decided to extend the London Green Belt northwards to include almost all of Hertfordshire. The London Green Belt now covers parts of 68 different Districts or Boroughs.
The government issues planning guidance [[1]] for the green belts defined by local authorities in England and Wales. Local Councils are strongly urged to follow this detailed advice (PPG2) when considering whether to permit additional buildings in the Green Belt or assent to new uses being made of existing premises.
By 2003, fourteen distinct Green Belts collectively safeguarded about 13 percent of England. In order of decreasing size these are as follows:
Area (km²)
5,133 London
2,578 North West (Merseyside and Greater Manchester)
2,556 South Yorkshire and West Yorkshire
2,315 West Midlands
825 South west Hampshire and South east Dorset (Portsmouth/Southampton/Bournemouth/Poole)
688 Avon (Bristol and Bath)
663 Tyne and Wear
618 Nottingham and Derby
441 Stoke-on-Trent
350 Oxford
267 Cambridge
262 York
70 Gloucester and Cheltenham
0.7 Burton upon Trent and Swadlincote
16,766 Total
The introduction of green belts was the culmination of over 50 years of environmentalist pressure with roots in the Garden Cities Movement and widespread academic interest in combating urban sprawl and ribbon development, as well as pressure from campaign groups such as the Campaign to Protect Rural England (CPRE)."
