Posted by **Ann** on Friday, May 25, 2012 at 11:31am.

Suppose we allowed each person 1000m^3 of living space in a large building, with ceiling height 3 m. To the nearest order of magnitude, how many 1000m high buildings would have to be built to house the entire population of 8.5 x 10^14 people on the energy-limited Earth, if each building's base were 100km on a side

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