"Transportation accounts for 28 percent of all US greenhouse gases, according to CNT, and I believe it accounts for an even higher portion of carbon dioxide emissions specifically. According to CNT president Scott Bernstein:
"Cities are more location-efficient - meaning key destinations are closer to where people live and work They require less time, money, fuel and greenhouse gas emissions for residents to meet their everyday travel needs. People can walk, bike, car-share, take public transit. So residents of cities and compact communities generate less CO2 per household than people who live in more dispersed communities, like many suburbs and outlying areas.
"If you're deciding where to live, consider moving to an urban area. You'll help fight global warming by emitting less CO2. And you're likely to drive less, so you'll spend less on transportation, saving up to $5,000 annually.""