It captures and uses rainwater, heats water and runs it under the floors to heat the house, filters and reuses sink and shower water, has a living roof that insulates the roof, runs mostly on solar power, uses bars of led lighting to light the house, and has double paned glass walls:
Here’s a non pre-fab eco friendly home for comparison, Idea House in San Francisco’s Mission District:
http://www.sunset.com/sunset/home/article/0,20633,1666702,00.html
This house, designed by a company that produces lithium batteries, apparently has all the conveniences of a modern American house, but can be disconnected from the power grid because it relies on solar energy, ceiling mounted quiet-running wind turbines, and a geothermal system, with lithium battery storage, for all of its power needs: http://www.hybridtechnologies.com/products/house_home/hybrid_living_home