> comment was buried under variations of the same argument: the vast majority of people cannot be expected to give up meat, and therefore to help both the environment and their health, and to stop killing animals, we should offer them artificial meat.

People historically have largely given up meat because it was too expensive at the time. To help the environment and stop killing animals, we should impose proper Pigovian taxes on meat (and/or the supporting process that directly produce the environmental impacts) so that they disutility imposed by eating meat is properly priced in. (This will also naturally create a demand for alternatives that substitute without the adverse effects to which taxes are attached.)