despite the fact that you decided to just ignore arguments I've just laid out, I'll bite. It is not trivial. In certain areas/regions growing vegetables is more difficult than rearing animals that can convert inedible grass/brush into consumable calories. Trucking in non-meat alternatives is carbon intensive. In other words problem lies with industrial food priduction and distribution regardless of kind of food. If food had to travel 1000 miles to get to your table on top of intensive methods of growing it - it's carbon footprint is enormous. Also industrial food production implies heavy fossils use at every stage. It's solving the symptom rather than the cause. Which is why I'd rather see cause addressed before we can turn to symptoms.