The number of people who live alone is increasing, and these "solos" tend to demonstrate sustainable living patterns, especially when they live in cities, says Devajyoti Deka of the Alan M. Voorhees Transport Center at Rutgers. Single people tend to rent apartments and use public transit, and they are more likely than other households to move to be closer to work. Deka, who has tracked behaviors of singles, found that solos flock to cities in part because they earn more there.

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