New research by the nonprofit Center for Neighborhood Technology comparing greenhouse gas emissions of city and suburban households has found that transportation-related emissions of people living in cities and compact neighborhoods can be nearly 70 percent less than those living in suburbs. This builds on CNT’s Housing+Transportation Index research, which shows that average transportation costs vary from a low of 14 percent of area household median income in transit-rich, compact communities, to highs of 28 percent or more in exurban areas where employment, retail, and other amenities are more dispersed. “If you’re deciding where to live, consider moving to an urban area," suggests Scott Bernstein, CNT’s President. "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.” CNT has put the information covering 53 U.S. metropolitan areas into an…