Green revolution sweeping the U.S. construction industry

By Frank Greve

McClatchy Newspapers

AURORA, Colo. - Rows of little plastic domes dot the roof of the new Wal-Mart Supercenter here, looking like a marching band of "Star Wars" R2-D2s.

Inside each dome, a trio of computer-aimed mirrors tracks the sun and bounces its light down a reflective shaft and through a milky white lens, illuminating the stockroom below.