> However, most big farms today do not farm sustainably
Is this true in the West though? It's not like we have a lot more forest to destroy... Soil erosion is definitely an issue, but AFAIK it primarily applies to growing plants (with e.g. artificial, fossil-carbon-based, unsustainable fertilizers), not animals.
The problem here is that a huge amount of the plants grown go towards feeding animals. [1] That’s probably one explanation for why estimates regarding the carbon impact of meat production vary widely.
Is this true in the West though? It's not like we have a lot more forest to destroy... Soil erosion is definitely an issue, but AFAIK it primarily applies to growing plants (with e.g. artificial, fossil-carbon-based, unsustainable fertilizers), not animals.