"Our digestive tract is not one of obligatory herbivores; our enzymes evolved to digest meat whose consumption aided higher encephalization and better physical growth." (provides no evidence that the consumption of meat results in better physical growth)
"Cooperative hunting promoted the development of language and socialization..."
Translation: It wasn't the meat itself; it was the long-term activity of coordinating with other people and developing strategies--- things which have much better substitutes in the modern world.
"Another point- It takes an entire acre of crops to feed a SINGLE PERSON for a year. Where as a cow or two can feed an ENTIRE FAMILY for a year."
---Stupidest_thing_ever_said. You have to take into account how much acreage is necessary to feed the cow, on top of how much acreage is necessary to shelter the cow. It takes 10 lbs of water and10 lbs of produce to put 1 lb of meat on a large animal. Taking that into consideration, the raising of the cow is by far a grosser space user, also taking into account it takes years of feeding and watering the cow, which could have covered multiple harvests in the same time frame over that acreage.
"Our digestive tract is not one of obligatory herbivores."
-And yet, he doesn't mention what our digestive tract is: that of a frugivore.
An omnivore which predominantly eats fruits and vegetables, and can break down meat if necessary, often to the detriment of its own health. Look up "carnicene" and "TMAO" sometime.
By the way, your same author (never mind that he's 40% junk science in his convictions) even says that the raising of meat is unsustainable.
"We pour all this energy into growing corn and soybeans, and then we put all that into rearing animals while feeding them antibiotics. And then we throw away 40 percent of the food we produce.
Meat eaters don’t like me because I call for moderation..."
The advent of fire and strategic aspects of hunting lead to brain development, not the meat itself. If it was meat itself,
"Cooperative hunting promoted the development of language and socialization...was, to a significant extent, based on domestication of animals-"
-The domestication of animals required the advent of horticulture, which required more expertise and knowledge base (it required a calendar, a working knowledge of propagation methods such as cuttings and air layering, etc). I could easily therefore argue that the drive to domesticate animals required much more thought toward plants.