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I've already addressed this. If they weren't doing it for pastures, they'd do it for other crops. Yes, doing so would be more efficient calorie-per-calorie. But the majority of the world doesn't have a calorie deficit. Meat is a better choice because it's more nutrient dense than what you could generally grow in these places.
As would transporting crops. The point there is moot.
There have been societies that have lived a nearly carnivorous lifestyle for thousands of years (inuits and maasai are the first to come to mind). There is no biological barrier to such a diet.
You haven't discredited shit. You merely posted an article which was EVEN MORE blatantly funded, just by fagtivists instead of industry.
You want another source?
Have it.