Isn't straw bale scary? Mattawa, Wash. public library. Image via WikipediaStraw-bale homes. The building code should be revised to make the performance of straw bale homes the standard (not the method, but the attainable performance). Then, if builders don't want to use straw, fine, but they have to build a house as well-insulated and tight as they could have with straw.
Nice straw-bale primer here.