That is great since a carbon tax is not a meat tax. Taxing the natural gas that goes into artificial fertilizers would increase the cost of a particular method

That is great since a carbon tax is not a meat tax. Taxing the natural gas that goes into artificial fertilizers would increase the cost of a particular method of maximizing the growth speed and weight just before slaughter, but its not a method that farming must employ. They could just let the animals graze land that have vegetation naturally grow without artificial fertilizers, avoiding the tax and accepting a slower growth speed. Any food that require artificial fertilizers would have to pay the carbon tax, making carbon-neutral food better in comparison.