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Globally, factory farming is dominant
It’s estimated that three-quarters – 74% – of land livestock are factory-farmed. That means that at any given time, around 23 billion animals are on these farms.
https://ourworldindata.org/how-many-animals-are-factory-farmed
You’ll find the environmental effects are more so categorical than because of how its produced
How do the distributions between plant-based and meat-based sources compare?
Plant-based protein sources – tofu, beans, peas and nuts – have the lowest carbon footprint. This is certainly true when you compare average emissions. But it’s still true when you compare the extremes: there’s not much overlap in emissions between the worst producers of plant proteins, and the best producers of meat and dairy.
Factory farming is very much a global problem that’s not limited to the US
https://www.sentienceinstitute.org/global-animal-farming-estimates
It’s not just more people that’s caused factory farming. It’s increase per capita consumption. The rates of per capita consumption are enormously different. If everyone ate like Americans, we would need 137% of the world’s habitable land which includes forests, urban areas, arable and non-arable land, etc. Cutting down every forest wouldn’t even be enough
https://ourworldindata.org/grapher/share-of-global-habitable-land-needed-for-agriculture-if-everyone-had-the-diet-of