I didn't realize that these products weren't derived from petroleum. I'll look into them. And thanks for yours and all the other posters thoughtful comments. I'm not anti-technology, nor am I anti-genetic engineering. I am, however, in favor of breaking our economy's dependence/addiction on a substance (petroleum) that is non-sustainable and supplied by countries I'd rather we didn't do business with. I view it as doing my part in the various wars we're involved in. It's one of the main reasons that I commute by bike, after exercise. If we have no dependence on their oil, we stop messing with them and a variety of problems go away. I'd like to support products that are produced internally as they provides job and reduce foreign dependence.