Green roofs are good. They clean the air, cool the house below, provide rest stops for birds and butterflies. If you work well with wood and want to try a green roof, why not start by building one for your dog?

Baring all in the war against global warming, an Elgin, Ill. based environmental group has released a nude calendar titled: "Is it Just Me ... Or Is It Getting Warmer?"

There is no question that green has captured the imagination, if not the pocketbooks, of new-home buyers. But that raises a question: What can sellers of existing homes do to compete with builders for the hearts and minds of potential green-leaning customers?