The issue there is that pigs and chickens spend their lives in confined pens, and to avoid mass disease outbreaks in those conditions, they're pumped with lots

The issue there is that pigs and chickens spend their lives in confined pens, and to avoid mass disease outbreaks in those conditions, they're pumped with lots of antibiotics (possibly growth promoters as well). Such facilities also produce vast quantities of fecal matter, leading to water pollution problems (and likely methane as well). https://www.rollingstone.com/culture/culture-news/boss-hog-the-dark-side-of-americas-top-pork-producer-68087/ https://www.rollingstone.com/culture/culture-news/boss-hog-t... Probably the best way to raise beef is small herds on grasslands, but this results in extremely expensive meat. That's more reasonable anyway: meat should be viewed as a luxury item, not a staple.