Greenbelts have long been considered an effective tool in containing and shaping urban growth. Other purposes of greenbelts have competed for priority throughout the 20th c., which complicates application and analysis of this tool. The core ideas were developed in London and diffused to many cities, including Jerusalem, where the British controlled planning from 1917 to 1948. Similarities and differences in the evolution of the greenbelts in London and Jerusalem reveal the variety of pressures experienced in open-space planning and bring into question the long-term effectiveness of greenbelts as a method of restraining urban growth.
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