[whitneyrzoller]

I know most can't do it but this is essentially the argument for higher density communities, enabling walking/riding to go to work and run errands. It is the reason why NYC's carbon footprint is so small (and conversely why the suburbs surrounding NYC have such a large CO2 footprint).

[hueving]

Most of the population can't afford to live in high density cities - at least not at the cost in the US to build high density. Compare the cost of a 2/3 bedroom apartment in NYC (to house the average family size) to the average income in the US.