May 7, 2008 - Study: Builders slow to go green Washington —- None of the nation's biggest home builders has fully embraced sustainable design or construction, according to a study released Tuesday. The study ranked Atlanta-based Beazer Homes No. 7 out of 13 for attention to environmentally sustainable design and construction. DuPont said the expansions will help meet growing demand for materials used in solar energy modules, packaging and auto parts.