It's happening as the term "green" is re-branded as well:
This shift isn’t occurring because corporate America’s heart suddenly started bleeding green. “Just five or six years ago, the term green building’ evoked visions of tie-dyed, granola-munching denizens walking around barefoot on straw mats as wind chimes tinkled near open windows,” Harvard Business Review ribbed in June 2006. “Today, the term suggests lower overhead costs, greater employee productivity, less absenteeism, and stronger employee attraction and retention.”
And every increase in the price of gas helps nudge this revolution along. Look on the bright side.