The New Scientist has an interview with William McDonough, an architect striving to design for "ecologically intelligent abundance." (Link from SciTech Daily. ) He writes of the Bedouin in Jordan:
Their tents are made of goat hair and are very loosely woven. They are beautifully lit inside and, as the outside of the tent gets hot, it causes an updraught that sucks air through the loose weave. If you open the tent flaps, the air comes screaming in, even though there is no breeze. It's brilliant. If it rains, the goat fibres swell up and the tent gets tight as a drum... When we built the offices for Gap in northern California, I used a ventilation system based on the Bedouin model to move cool air across the concrete floors all night long for free, and to get free, fresh, cool air all day long.
Near the conclusion of the interview he advises (in regard to converting old-timers to his way of thinking), "never try to teach mules to play the violin. It sounds terrible and the mules don't like it."