Accessibility: travel time to major cities

Take a look at the global map of travel times to major cities. It's quite interesting that 95% of world population lives in 10% of the land, but it's more awesome that only 15% of the people in developed countries live more than one hour far from the nearest city, whereas this rate increases to 65% in developing countries. Forget about developing a local community in the forest, economic growth requires human concentration and travel times are an essential factor.