The interesting thing about these population change maps is that the trend over my lifetime has not only been from country to city, or at least metro area, but also from North to South. When I was younger, air conditioning was pretty rare, but nowadays everyone's got it, so the South is more liveable - warmer winters and all that. But with climate change, hot summers will become REALLY hot summers, so I wonder whether we'll see the population shifting North again.
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"Don't take life so serious-it ain't nohow permanent."
"Everybody's gotta be somewhere." - Eccles