With an estimated $200 billion in U.S. health-care construction planned for the next decade, how hospitals are built and operated will have a huge impact on the environment. And Gail Vittori means to have an impact on those hospitals. With her husband Pliny Fisk III, Vittori is co-director of the Center for Maximum Potential Building Systems, a nonprofit design center in Austin, Texas. MaxPot, as it's known, advises institutions of all kinds--from a homeless shelter in Austin to the Pentagon as it rebuilt after Sept. 11--on how to adopt environmentally sound materials and practices. But Vittori and Fisk have a special...