I finallly got a tour of the San Francisco Public Utilities Commission's cool new building at 525 Golden Gate. It's about as green as an urban building can be, with solar panels, wind turbines, a wastewater recycling system using the underground root structure of street gardens to clean sewage ... the energy use is about 30 percent below a typical building that size, and water use is even lower; the PUC projects about a 60 percent savings, which is a good thing for a water agency that wants to promote conservation. Read more »