why density?

being raised in suburbia i sometimes long for the backyard to throw the frisbee around (or in the fall, a football). then i remember that i've read things and walk my ass down to the park.

from Better Dead than Red:

The population of New York City is larger than that of 39 states. But because dense apartment housing is more energy efficient, New York City uses less energy than any state. Conversely, suburban living--with its cars, highways, and single-family houses flanked by pesticide-soaked lawns--saps energy and devastates the ecosystem.