I question the methodology of that 100kg (per kg) figure for beef, for several reasons:

1. It's not the true Carbon or CO2 figure. It's weighted for other greenhouse gases. That's kind of an issue because methane naturally breaks down (into CO2 and water) over time. The methane issue comes up all the time in such estimates (eg leaks in natural gas pipelines) where methane is a worse greenhouse gas but temporary (7-12 years) and CO2 is essentially forever (until sequestration or photosynthesis);

2. Production method really matters here. American beef, for example, is primarily grain fed. That grain requires fertilizer (more natural gas) and distribution. Australian beef, for example, is largely fed on natural grasses and vegetation, typically until the last 60-120 days where it's transitioned to grain for marbling. American cattle is also heavily fed on corn, which really shouldn't exist in the quantities it does;

3. Ecosystems are complex. One of the big causes of the dust bowl, for example, was the destruction of the great bison herds. Replacing the natural grasses with crops like wheat was just the last straw. The point of the bison is that they're heavy, like up to 2000+ lb heavy, and they leave deep hoof prints on the plains. Water collects there when it rains and feeds cgrasses and the aquifers.

This has been backed up elsewhere too. China has had long projects to stop the desertification of the Gobi and spent a ton on planting trees with varied successes. You know what did work? Horses. They released horses and the same thing happened. Horse hoof prints allowed water to collect and grasses to grow and spread. Grasses, as it turned out, were key to stopping desertification, not trees.

So the point is that certain ecosystems need large herd herbivores to survive. So if you got rid of cattle entirely, what other second order effects would there be?

More practically, people just arne't going to give up meat. Sorry. Unless it become sprice prohibitve (as beef arguably is rapidly becoming now).

On the ecological point, the difference is whether the grassland would naturally support that number of bison. Or if bison (or cows) are continually being grown, killed, grown killed at industrial scale beyond the normal bison lifecycle. With many carbon inputs (fossil-fuel based fertilizer, etc) and production costs (slaughtering, transport, etc).

Wild bison live 15-20 years.

Cattle raised for beef ~18 months.

That's beyond the natural carbon cycle an existing ruminant population.

Also horses, in my reading of the data, actually have less of a methane impact. They have a different digestive system entirely.

On the methane point, methane, yes, is a greenhouse gas that breaks down over years (~12 years). But has far worse impact on climate while its in the atmosphere.

It’s completely made up. All meat is carbon neutral because animals don’t produce carbon atoms from nothing. They get them from the plants they eat which in turn get their carbon from the atmosphere.

The carbon cycle is basic scientific fact yet confidently ignored by people who hate things like logging and meat.