Interesting fact: cities are the most environmentally-friendly form of living. This post from the NYTimes blog discusses recent statistics showing that urban areas have lower per capita carbon emissions than either suburban or rural areas.
It's counterintuitive when you think about all the pollution in cities, but the average city lives in a smaller home, tends to take public transportation and shares services with more of neighbors. Outside of cities, people live in larger homes (which need to be heated and cooled) and use more energy transporting themselves around.
A nice quote from Ed Gleaser at Harvard sums it up: "“If you want to take good care of the environment, stay away from it and live in cities.”
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