Indeed. And there may come a time when such emissions are enough to matter, but we should then just apply a proper tax to them (as well as airplanes). That’d encourage using alternatives (like hydrogen which is actually a superior rocket fuel from an exhaust velocity perspective but is harder to handle and leads to greater dry mass) and also provide incentive to pull such emissions from the atmosphere. Elon Musk has advocated such a broad carbon tax, including on SpaceX’s rockets (which use kerosene and eventually methane).