Steven Johnson, author of "The Ghost Map." says it's good that more people are living in urban areas. Traditional cities - not sprawling cities, that is. He maintains that dense urban settlements like New York City and London are efficient. He sites more walking (less emissions) and lower childbirth rates (fewer people) as two ways cities are sustainable.
This topic has come up before, but I have to wonder if this author - who really focuses on how cities work - can't bring more attention to the discussion.
[Johnson was interviewed by MPR's Andrew Haeg for the feature: Of microbes, patterns and the urban condition]
American Public Media Interactive Producer