The Social Market Foundation says the government will have to build on the green belt to meet its housing targets.
The Social Market Foundation have produced a study that says at least two thirds of the 3m homes Gordon Brown wants built by 2020 will have to be developed on new land, or on existing green belts - areas set aside to prevent towns and cities colliding through the urban sprawl.
Should the system be overhauled before the government's housing plan hits top gear? Or should the established green belts be left well alone?
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