CO2 production is not the only environmental harm. You're being pretty uncharitable by presenting that crowd as hysterical but not addressing their actual arguments against cattle farming.

It's hard not to be uncharitable to people who claimed that meat production produced more CO2 than cars, which is insane, and also completely false.

I also find the methane argument interesting, but not convincing. For certain methane production from cows isn't nothing, but it's not like we haven't seen masses of bovine like animals on this continent before. There's about 94m cows in America today, which is a lot, but not in excess of the 50m-100m Bison that inhibited the continent before we killed them all. The Bison did not warm the earth, and presumably they farted.

There are for certain problems with grazing cattle in some ways, especially in countries where they're cutting down forests for grazing room (looking at you, Brazil). I'm not saying that we should just ignore everything and keep on as is. I'm just fed up with people imagining that the solution to global warming is the crazy moonshot plans (let's milk spiders!) rather than the boring incremental stuff (walk more, focus on effective land/animal management). The EPA for their part recommends more judicious use of fertilizers, using higher quality pastures, and more careful manure management as the path to reducing CO2 emissions from agriculture.

What percentage of methane, btw, which is a much stronger greenhouse gas?

Hard to tell. Methane dissipates very rapidly, making it hard to tell exactly where it came from.

For my part, I have a very hard time imagining that cow farts, which come from carbon already in the fast carbon cycle, are worse than the amount of natural gas that escapes from our wells and old distribution systems.

It’s also important to note that well managed pastures sequester carbon, which is relevant here.