. >> heat, light, hot water, hot air, photosynth sister and the pure destilled water and the energy ito evaporate it. >> there's no heating system in the house, and yet crops sprout here even during the winter solstice. >> it's really fun to sit here while it's blizzarding outside and monitor your tropical fruit and realize you're not burning any rotted remains of primeval swamp goo. >> during the day the house runs on solar power. lubens sells back any excess to the grid. purchased wind power fuels the house at night, and fully charged batteries serve as backup in case the grid goes down. >> collecting hot water in here. >> luvens knows that most people won't build homes like his. >> runs on ambient light. >> but he insists we can start to save the earth and save money just by being a little more efficient in our energy use. >> the u.s. could get completely off oil and colby 2050 with a 2.64 bigger economy and eliminate nuclear energy and use a third less natural gas. $5 trillion cheaper than business as usual. not counting any hidden costs like carbon emissions. >> in reinventing fir