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> Cows and ruminants have been roaming the Earth for a long time. If they were a huge contribute to global warming, it would be pretty hot already.

The number of cows has of course massively increased over time.

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As a slight diversion from the carbon focus, the proportion of animals that is cows has increased drastically, as well. Look up the animal biomass proportions. It's shocking (sickening, even) to learn what proportion of the mammal biomass is cows and humans, and what proportion of the animal biomass is cows, chickens, and humans.

I’m inclined to think so but wasn’t America full of hundred of millions of bison at one point.

80 million before 1850 according to Wikipedia. Now we're at about 1 billion cows worldwide, so it would depend on the number of cows/bison in the rest of the world at that time.

https://animalclock.org/

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