> most of people can't afford cow's meat anymore. Most people are living on pasta and eggs, eventually they eat pig and chicken but that's getting rare.
It shouldn't be cheap. The world got used to the luxury of cheap meat by being unethical and harmful to the environment (humans' environment) and animals.
Cows are insanely resource-intensive to farm, bad for the air, bad for the water, bad for the land. Factory-farmed chicken meat is infamously inhumane, using genetic mutants to produce more meat faster, as well as being bad for the environment. They require more land and water use just to produce the feed for the animals. Both produce toxic runoff that goes into our water and land. Drugs pumped into animals land in us or our water, causing cancer or breeding superbugs. And we accept all these negatives so we can buy a cheap burger we don't need (we have plenty of other food).
Pigs are actually pretty sustainable, as are rabbits, goats, and venison. We used to eat a lot more of them, before the factory animal farms changed our diets to prefer cow and chicken.