I'm seeing a lot of claims like this: The Politics Of Protein.
I agree with most of the arguments, but I usually end up with the impression that all this amounts to not being able to give up the desire and craving for meat. Maybe if the people that make these claims were not carnivorous, letting go of meat wouldn't be so much of a concern.
I lived in India some years, where most people don't eat — and also don't like — meat. And is OK, not a problem. Besides desire, eating meat is a cultural construct, and not the best one, especially in times like now.