h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

Or the forests or mountains or arctic islands or sea floors:

'One-half of the world's population will live in cities in two years, the United Nations says.'

http://www.cbc.ca/story/world/national/2005/02/16/world-pop-050216.html

I don't really see this as a head for the hills kinda thing, something like a third of the world's population live in cities now, it is where the jobs are. With mechanization, farming has become less labor intensive and the one man with a tractor can now do the work that it used to take a village to do.

I was sort of joking.

However. . .

'it is where the jobs are'

Far too often, the village has been replaced by a man with a tractor and the city is mostly barrio.

Ancient Greece is generally reckoned to be the birthplace of modern 'Western' democracy. In Ancient Greece, people lived in cities, with small numbers in the countryside to keep the crops growing. It's a system that works.