At Richaven, we believe that sustainable design is more than just returning to basics of good design.  Sustainable design is about improving the impact that our built environment has on our planet.  We believe that sustainable design and existing buildings go hand in hand for several reasons.  Material conservation, reduction in carbon impacts, generation of jobs and rention of our cultural history are just a few.  For more, see our presentation on the future of historic preservation to the 2011 Society of Industrial Archaeologists conference.