December 18, 2012
All, actually! Trombe walls, solar cookers, PV, water- solar, harvesting, structuring & grey water, wind, geothermal, bio-diesel, envelope houses, over-unity, etc...just doesn't make sense to me to NOT use them!
I love solar energy- been involved with passive and active systems off and on for more than 20 years, including solar cooking. I'm interested in all forms of 'alternative energy'. I look forward to learning more new things!