You know you've got a passionate architect on your case when he spends 6 months on-site, without a day off. The product? Summit Haus in Utah, the United States, which has an energy footprint of only 10% of a regular home.
The key takeaway here, however, is not the technology or remarkable design choices that make the two-storey building as such. It's the fact that demand for such houses has increased - reflecting a new generation of eco-conscious house-buyers willing to sculpt their lifestyle choices to do that little bit for the environment.