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How would you see population doubling? Mass immigration or baby bonuses and 5 child families?
Mass immigration that drives a baby boom as well. Target people who wanna bring families, and countries where decent sized families are common.
If we had denser cities AND largely kept the arable land for plentiful food, we'd be an attractive proposition.
The difficult thing is convincing people here that density done well is GOOD - and getting family-friendly density. So many builds don't cater to families & so many NIMBYs hating on every development that happens.
Across the road from my house, a developer bought 4 traditional suburban houses next to each other (Just over $1mil each), now they're building 33 townhouses on those 4 sections. (24 one bedroom units sold for about $635k each, 9 two bedroom units sold for about $730k each, you do the math on profit there..hehehe)
I say great! BUT they're all 2-story 1 or 2 bedroom units - great for couples or small (1 or 2 kid) families, but 3, 4, 5 kids? Forget it.
We need more 3 story, 3 or 4 bedroom units in the mix.