The theory of biomass says that the ratio of plant mass to cow mass should be pretty much the same no matter where you are.

But the difference is whether the cow is actually allowed onto the land to access that biomass itself, or whether somebody harvests the crop and processes it into cow food. Which typically also involves lost of chemicals to improve biomass produced per hectare of land.

The issue is the methane which the cows generate in the digestion process and emit. Methane is a much more powerful greenhouse gas than CO2. So one should talk about CO2 equivalents here, not CO2.

Why do cows with more land area supposedly emit more CO2 equivalents ?

And if I eat hunted venison , surely I am preventing the deer from burping out more methane . So is that not better for the planet than being vegetarian

I didn't bring up the land use argument, so ask elsewhere. But if one thinks of deforestation in places like South Ametica to create farm land, that will have a negative carbon effect.

The other point ...

I tried the Lady Christl new potatoes from Denner today, really nice taste

I’ll check out my local Denner, thanks

Enjoy, nothing like the Jersey Royals sadly, every Spring I cry into my pillow