National Public Radio: First of two parts While much of the U.S. real estate market has been floundering, one area has not seen a dip. Green building now accounts for nearly one-third of new construction in the U.S. That’s up from 2 percent in 2005, according to McGraw-Hill Construction, which tracks the industry. The numbers suggest a revolution is taking place within an industry that is historically slow to change. There are many factors — and many players — in this move toward green …