I wouldn't call the lifestyle of 20% of the planet a "small problem". Also, just because someone lives in a city (which can be as small as 2500 people and isolated[0]) doesn't mean that they never leave it.
0. https://www.citylab.com/equity/2012/03/us-urban-population-w...
http://www.writework.com/uploads/12/122436/english-chart-ill...