If everyone becomes a vegetarian, then what will
we do with all the farm animals?
Farm animals exist in such large numbers only because human
beings breed them for slaughter, often through artificial
insemination. As more people become vegetarian, fewer farm
animals will be bred, and their population will be reduced.
If everyone eventually becomes a vegetarian, then the number of farm animals which will exist will only be a tiny fraction of the number today.
Follow up questions:
Aren't the animals already dead when we purchase meat in a grocery store?