When?
I don't know. I know the population growth rate. But i don't know the urbanisation growth rate, and I also need to know the possible density/change in density of those areas, then I might give you an estimation. Basically I need to find the relationship between the rate of change in urbanisation per each change in population but it's not quite that simple because the density is changing to.
But not for awhile. But as someone who works with numbers, I can tell you we are not going to suddenly jump from below 10% to 90% percent in a hundread years.
We might have food problem and energy problems, but space ain't one.
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