Spatial imbalance of human settlements

Visualization of narrower problems
Nature 
If the population of a region is weighted too far toward small villages, urban civilization can never emerge; but contemporary trends for people to leave their farms, small towns and villages and crowd into the cities leaves vast areas depopulated and undermaintained. The population is weighted too far towards big cities, letting the resources of the land go to ruin.
Type 
(D) Detailed problems