But their shit comes from plants and they get their carbon from the air.
The unnatural additions to that cycle are fertilizers (more nitrates than normal) and complex organic chemicals (pesticides, antibiotics, …).
The carbon cycle is undisturbed by them.
Partially true. Factory farm animals are not natural.
I don’t know, animals sound pretty natural to me. Maybe the walls aren’t, but I don’t think that’s what you meant
Majority of livestock animals would not survive without humans.
But their shit comes from plants and they get their carbon from the air.
The unnatural additions to that cycle are fertilizers (more nitrates than normal) and complex organic chemicals (pesticides, antibiotics, …). The carbon cycle is undisturbed by them.