Forbes -- Building Green -- $12 billion bucks in 2007

Here's an excerpt from the article:

"The U.S. Green Building Council estimated the green building industry--an area that was rarely heard of a decade ago--to be worth around $12 billion for 2007. While sustainable construction is one of the fastest-growing segments of the commercial building industry, only a small percentage of buildings going up are actually green. The buildings that do meet green standards save significantly on energy costs, a benefit that is likely to become more attractive as the cost of non-renewable energy sources continues to increase."