The vast majority of people are living and travelling within cities. You're talking about a small problem that's getting smaller every year. See this chart:
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.
http://www.writework.com/uploads/12/122436/english-chart-ill...