In regard to the academic bias of vegetation based diets, it seems to me to run in parallel to the political correctness movement. In other words; an orchestrated attempt to persuade the thoughts and actions of the masses without regard to the facts or consequences.
If one were to put a conspiratorial consideration into that then it would instead be considered an attempt to persuade the masses away from meat due to the facts and consequences. When one also considers that bovine flatulence is considered by the IPCC to be harmful to the global environment, worthy of heavy taxation by the U.N., the conspiratorial viewpoint doesn't seem far-fetched. Fact: CO2 is plant food. Just ask any commercial greenhouse grower. An elementary school science lesson on how the food chain works, combined with secondary education level economics (supply & demand), should dissuade any notion that CO2 can harm the environment.
MrSatan As for eating only meat, there's a huge difference between surviving fine and eating healthy. Also modern lifestyle differs greatly from needs of people of ice age. It's kinda the same with vegetarian diets. You can survive on them just fine, they even tend to be better than most diets in general, because most people don't eat healthy at all, but there are certain risks and certain nutrients can me more difficult to get than others. Also, no vegetarian diet will be better than "perfect" mixed diet (which apparently won't have much meat in it).
Please exercise caution when comparing the modern lifestyle to that of the last ice age. Human biology didn't change because it got warmer. If anything, greedy corporations with little to no morals have done more damage with sugars, fillers, and artificial ingredients than any environmental changes could possibly have done on their own. The cost of real food is relatively high compared to the mass produced junk on the shelves at most grocers, and there is the tendency towards laziness that has caused a boom in the fast food industry over the past few decades.
Also, we are on the precipice of a new ice age. This will have drastic consequences, not the least of which being a prolonged shift in weather patterns.
In the past 18 months I've seen/read/heard reports of record breaking weather of nearly every category. Record snowfall, record rainfall, flooding and lakes in the deserts around the world, record hail, and much more. Naturally, a drastic shift in global weather patterns will affect global food supplies.
If anything, I recommend learning how to produce both meat and vegetables for yourself. At a minimum, a greenhouse and a chicken coop if you have any space for them at all. If you're in an apartment then build planters on balconies and window sills.
Note: I had to remove over a dozen supporting links and log out and back in to post this. I guess this has to do with spam filtering.