> I didn't mean that the entire earth is as dense as a city. I meant that there are very few places you can go and not be within (say) a day's walk of another human.
I mean, isn’t that true for most of Canada, Russia, Antarctica, central Australia, Mongolia, and even large parts of the American West?
You'll be surprised. You can actually use Google earth to explore these regions. Even in what seems at first to be empty space you will find little towns, military installations, vacation lodges. Yes, there are still a few remote regions that are truly untouched by humans, but they are quite rare. Extreme latitudes (Antarctica, Siberia, northern Canada) and the Amazon are probably about it. Numbers are hard to come by but I'd be surprised if more than 20% of the earth's land area was more than a day's walk from civilization.
I mean, isn’t that true for most of Canada, Russia, Antarctica, central Australia, Mongolia, and even large parts of the American West?