Today, plenty of buildings are described as sustainable -- using less fossil-fueled power than traditional structures. But certain designs, like that of the zeroHouse, threaten to revolutionize the idea of green building and overshadow predecessors to radically redefine sustainability. Few buildings truly live up to the idea of sustainability in the way the zeroHouse could. Using cutting-edge, green technology, the zeroHouse design works completely off the grid (as in the power grid), feeding only on the renewable energy of the sun.