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Don't just single out meat. All of industrialized agriculture is massively carbon and energy intensive and built on gradual topsoil depletion.
Meat industry is responsible for most of the farmland. If everyone was vegan we could reduce the amount of farmland we use by like 70%. Thermodynamics says its better to eat plants instead of feeding them to animals and eating animals.
Biology teachers when them teaching the 10 percent law for ecological efficiency to their class 5 years ago is actually useful
Transitioning to plant-based diets (PBDs) has the potential to reduce diet-related land use by 76%, diet-related greenhouse gas emissions by 49%, eutrophication by 49%, and green and blue water use by 21% and 14%, respectively, whilst garnering substantial health co-benefits
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Plant-based foods have a significantly smaller footprint on the environment than animal-based foods. Even the least sustainable vegetables and cereals cause less environmental harm than the lowest impact meat and dairy products [9].
https://www.mdpi.com/2072-6643/14/8/1614/htm
If I source my beef or lamb from low-impact producers, could they have a lower footprint than plant-based alternatives? The evidence suggests, no: plant-based foods emit fewer greenhouse gases than meat and dairy, regardless of how they are produced.
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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.