Maybe I’m using the wrong term but my understanding is that the carbon comes from the feed, which itself pulls it from the atmosphere. Thus, it came from the air, and goes back into the air.
The fossil fuels did the same but on a grander scale and longer timeline where the carbon becomes sequestered. Carbon taxes on that make sense.
From what I understand carbon comes from the soil as well as from the air, and it's supposed to be "stored" back into the soil by various means but our agriculture and more generally human activities tend to accelerate release of carbon from the soil and refrein the storing process. And that provokes a climate disimbalance.
There was a good video on the relation between carbon cycle and massive extinctions throuhout history (1h long) : https://www.youtube.com/watch?v=uxTO2w0fbB4
The fossil fuels did the same but on a grander scale and longer timeline where the carbon becomes sequestered. Carbon taxes on that make sense.
I’m not seeing the benefit to taxing the cattle.