The entire premise of that thread is questionable. Sustainably managed rotaional grazing pasture fed beef is a grassland ecosystem, quite similar to what much of the United States looked like when buffalo roamed before european-heritage settlers.
Destroying forests to make pastures is environmentally destructive, but a large portion of our country can be utilized as pasture while maintaining an ecosystem not unlike how the land was before capitalism transformed it.
https://news.ycombinator.com/item?id=31477819
George Monbiot: "[...] there is no major farm product as environmentally damaging as organic, pasture-fed beef."