I don't care if my range is powered by alien technology that magically sequesters carbon somewhere else - When you heat something above a certain temperature, you are producing all kinds of chemical compounds that are not going to be good for you. It doesn't really matter how the mass was brought to that temperature. The contribution of a gas range to indoor air quality is absolutely negligible compared to what comes out of a deep fryer or frying pan once you hit 400F+.
If the primary concern is everyone's health & safety, we should mandate high CFM extraction hoods be installed above every range and run public information campaigns to encourage their use.