It is an important point: "For homeowners interested in going green, the lowly water closet turns out to be a big player. Americans flush away 4.8 billion gallons of water every day — nearly 40 percent of our total indoor water consumption. Cleaning the sewage stream requires vast amounts of energy and chemicals and is often flawed."
However one article in an entire magazine section seems light. Surely there is greater interest in green real estate than this. ::New York Times