Greenhouse10_0017_ls.JPG View off the top floor of the terrace off the main floor and of the backyard. This Marina Green Showhouse combines high-end design with practical and beautiful green building techniques, including an air purification syste

greenhouse10_0017_ls.JPG View off the top floor of the terrace off the main floor and of the backyard. This Marina Green Showhouse combines high-end design with practical and beautiful green building techniques, including an air purification system, recycled materials, touchless faucets, double-pane windows, thermally efficient insulation, low-VOC paints, energy conserving appliances and solar panels. Photo taken on 060407 in San Francisco, CA. Photo by Lea Suzuki/ The Chronicle ()cq (Photo By Lea Suzuki/The San Francisco Chronicle via Getty Images)