>It's not just their bodily functions (which are very significant despite your feelings)
So were the bodily functions of the wild bison, and a boatload of other species that have disappeared or shrunk togheter with their methane output in rough equivalence to the growth in livestock and it's methane output (at least in the US tho I assume such calculations would be similar elsewhere.)
Additionally anything they put out is a temporary problem part of a carbon cycle. The shit they fart out was once gras and will go back to it a few decades down the line. Wish to reduce that ouput to buy ourselves some time (to excuse pumping up more oil and the like for a little longer) and you basically end up with chicken and similar animals as the acceptable solution.
So yeah cow farts are not the factor to look at when looking at the relentless increase in CO2 ppm.
Similarly most sequestration investments and drives are often little more than a scam, copium, equivalent to the push malicious push for single use plastics recycling by plastic manufacturers or at worst a push down the price of co2 for EHR.
There is one source we keep making excuses for ad nauseum that is a new introduction into this all and it's the hydrocarbons sequestered for untold years that we pump up(and methane from tundra now defrosting oh and the reduction in boglands.)
No replacing those fields with forest won't be your cure. Sadly they barely sequester anything at all compared to what we're putting out even if we'd severely reduce it. They largely take it up, die, rot and release it again in the process. We can rely on it if we accept our solution to take thousands of years.
>it's the enormous amount of land we clearcut and leave basically empty so they can graze.
I agree it's an issue. However remove it and you'll have a different one.
The fertilizer their manure makes up a significant portion of will probably be drawn even more from hydrocarbons (and rather finite resources like cheap phosphorus from morocco).
The same hydrocarbons that produce an actual very long term issue.
I have little trust in incentives leading us elsewhere.
Perhaps you wish to avoid this by forcing techniques that will generally ... require more land for the same output or for land to be left "basically empty".
I'd see some good things coming from such harsh increase in food prices and availability at least.
Some negative pressure on our relentless population growth, perhaps we'll learn to more often ditch some silly concepts such as unused lawns.