In North America, we are generally desensitised to our surroundings, whether they are buildings or forests. This lack of awareness makes it easier to accept the fact that cities, towns, and suburbs are all built for us, not by us. It also makes sensible urban planning or policy difficult. The results have not been pretty. Cities are dysfunctional in part because we have built them in ways that pollute our ecosphere, something that harms our health in a direct way. Ecological stupidity is also economic stupidity, and North American urban development is incomprehensibly expensive. But cities also don't work socially: their design discourages casual public contact, which is the source of strong local communities and of self-confident collective action. Fowler points to numerous examples of humans who have transcended this culture of separation.