http://jalopnik.com/cars/news/hondas-oil-burner-is-nigh-clean-diesel-coming-by-2009-203067.phpIt absorbs NOx from exhaust gas and converts a portion of it into ammonia, which is also absorbed and used later in a reaction that converts the remaining NOx in the exhaust into nitrogen (N2). That nitrogen is, in turn, converted into grape soda, which is frozen and served to local schoolchildren in the form of popsicles.