MARIAN KEELER, ASSOCIATE AIA, LEED AP, is a San Francisco-based green building consultant, formerly with Simon & Associates, and a specialist on healthful building materials. PRASAD VAIDYA, LEED AP, is a Professor and Area Chair for Building Energy Performance at CEPT University in India, and Director at zenerG, a San Francisco-based consultancy that specializes in projects, programs, and policies toward sustainable net-zero-energy solutions.