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The Green Arc vision: "Bringing the Big Outdoors closer to people through the creation of an extensive and attractive and valued recreational landscape of well-connected and accessible countryside around London, for people and wildlife."
London's Green Belt covers around 500 000 square kilometres, extending far into the Home Counties.

Since its establishment in 1955 the Green Belt has successfully prevented urban sprawl, helped to keep land in agricultural use, and maintained the identity of surrounding towns
but...
New and increasing pressures on the Green Belt demand a strategic approach and more positive management, such as that offered by the Green Arc project
http://www.surreycc.gov.uk/?a=184710