As the population of Earth nears the 7 billion mark, and urban sprawl hangs like a smoggy spectre over the planet, the availability of land is a pressing yet volatile issue. This is a paradox, if not plain stupid, given how much wasted land is available right in our cities.

I have to fly to Parliament almost every week and as the ageing BA jet flies over Johannesburg and Cape Town, it gives one a bird’s eye view of the large quantities of wasted resources represented by our land use in both ...
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