The second generation moved into manufacturing truck bodies, industrial insulation materials and air conditioners (in partnership with Fedders Corp.).

FORBES: Pipe Dreams

Other resource-efficient projects like New York's 4 Times Square office building, Atlanta's EarthCraft House and Village Habitat Design's cohousing conservation communities include such innovations as energy-efficient insulation, water and air filtration, or hydronic heating, aiming for healthy, nontoxic construction processes and buildings for humans and the environment.

CNN: Developer advocates 'spiritual' approach to building

The 12, 700-square-foot Energy Star-certified house was crafted from low-toxic materials, withstood air tightness tests on the insulation, and has a water furnace geothermal system that provides hot water, radiant floor heat and air conditioning.

FORBES: Off-The-Grid Mansions