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Much is made of the limited space available on the surface of the Earth, especially for housing and especially in the urban areas to which people have tended to move from the countryside. This form of "lateral thinking" has been associated with much-regretted forms of urban sprawl and increasingly problematic access to adequate housing in urban areas. At the same time the urban sprawl has increased pressure on undeveloped areas,...

2007-08-20

 underground real estate Earth vertical deep