I read the article and it seems like some details are missing. First and foremost, while the costs, wastes, & inefficiencies are mentioned for meat, the costs, wastes, and inefficiencies for what would replace meat in our diet is not mentioned.
Also, we would not as a society wholly or significantly replace meat with the same grain being fed to the animals; the flavor and nutrition differences are far too large. Even the 'fake meat' products from
Boca,
Morningstar Farms, etc. only do a fair job of mimicking the texture and a sub-par job on taste.
Second, the 800 million "hungry humans" argument is a straw man. It has
never been about food production. It has
always boiled down to politics, local economics, and distribution.
I'm not defending the meat industry. My personal and our household meat consumption is pretty low. As someone battling moderately high cholesterol without drugs (but under a doctor's supervision) I have cut way back on meats in my diet. I haven't eaten a real egg in a couple of years. Breakfast is either
cereal with skim milk or a mix of fruit &
granola. Lunch is either salad or that childhood favorite PB&J. Dinners vary but may have meat or just be vegetarian. It's easy to eat vegetarian at most restaurants - vegan would be another matter - like Mexican, Italian, and Chinese/Japanese/Thai/Indian/anything Asian.
My second & fourth paragraphs appear to contradict each other, but my food tastes are many and varied. I like virtually all cuisines and am just as comfortable with chopsticks as I am with a fork & knife. Most people seem to have a comfort zone and stick to that instead of being open to trying new things.