Meat that is fed by feed lots and other corn or grain fed systems.

But there are better methods of feeding animals for human consumsion.  The problem is that we can't eat as much meat as we are doing so today.  We have to eat more sustanible meat, and that means less.

But to totally take meat out of our diet is a no go, for the masses of people.

Reducing the masses of people on the plant might be a good thing, how to go about that is the issue, we need 10% fewer people in the next decade, not 5% more.

Death always seems to lurk around the corners or our discussions.

The best human protein is Whey that comes from milk.  we could make all the beef cattle milk cows and do away with the hamburger joints of the world, alone with the KFC's of the world, that leaves us most fish, which we have depleted to such a level that we might as well just deplete our own herd to make up the shortfall.  

 Oh gloomy day,  the human population falls by 10%.  

 Sorry, but as peak oil hits, we also hit peak food, no matter what we do.