Here in Canada most dairy farms are definitely industrial entities in the sense that they've got hundreds of cattle and are largely automated.

And we already know that it's possible to significantly reduce cow methane production by feeding them a small amount of seaweed...there are probably other ways as well.

By taxing them for cow burps and then giving them money back if they do the right thing, it provides a financial incentive to do the right thing. This is known as a "Pigouvian tax" in economics.