San Francisco Chronicle: A city with a minimal carbon footprint looks a lot like San Francisco, where residents tend to commute by bus or train, live in apartments and walk to nearby shops and restaurants.
Nationwide, those kinds of cities are keeping greenhouse gas emissions low - but their outlying suburbs essentially negate those climate benefits.
In fact, suburbs account for 50 percent of the nation's household carbon footprint, even though they are home to less than half of the U.S. population, according to a...