My Eco-Shed is "deep green" -- it is a passive-solar design that requires very little energy, and thus carbon emissions, to heat and light. We built it with 95 percent reclaimed or sustainably harvested lumber (the rafters you see supporting the roof were once part of a railroad trestle). The steel roof is configured for rainwater harvesting, the insulation is well beyond code requirements, the foundation uses low-fly-ash concrete, and we used innovative framing techniques on the north wall to lessen heat loss. The building also includes a heat-recovery ventilation system, highly efficient lighting and plumbing fixtures, and it is surrounded by an organic food-garden-in-progress.
The shed is the focus of my forthcoming book, ALMOST GREEN, which will be published across North America -- and hopefully the world -- in Fall 2008. Google for more.