[Source: Adam Hochberg, National Public Radio] — Phoenix is one of the nation’s fastest-growing and most sprawling metropolitan areas. Cheap and plentiful land has led to an ever-expanding ring of suburbs, and commuting downtown can take longer than an hour.  Now, a small developer is buying up foreclosed houses near mass transit lines in the city, renovating them to green building standards, and marketing them to young professionals who may be tired of commuting.  [Note: Listen to the broadcast or read the transcript at In Phoenix, luring suburbanites to greener, urban life.]