Industrial beef is fed grains that could be instead used to feed humans (or, at least the land used to produce these grains can instead produce human food). This is a far more efficient use of calories. People worried about food insecurity should be looking at reducing meat production for this very reason.
> It's a luxury.
IMHO it's not a luxury in the same way that caviar and champagne are, it's a luxury in the same way that fresh greens are a luxury compared to frozen peas.
Medium or long term though, practically all other domesticated animals are more efficient than beef on a per-calorie basis. Chickens in particular, are substantially more efficient. Best case, replacing beef with chicken could increase meat yields by 10x, worst case, by 3x.
yes, this is true, although some of those, like chickens which you mentioned, or pigs that are mentioned in the link you shared, are dependent on grains - unlike beef, which can be grass-fed.
But there are more animals besides beef that can be grass-fed, and they might be more efficient than beef.
It would be interesting to know the feed conversion ratios of goats and sheep for example.
The problem of goats and sheep is that, in a regenerative faming context, their manure is not perceived to be as effective as cow manure.
For this reason, would be interesting to measure both feed conversion ratios AND manure production ratio.
Knowing the effectiveness of manure in a regenerative farming context is very important, unless we want to continue depending on fertilisers made from petroleum which is just as bad as burning gasoline in terms of global warming.
I would expect that the more food shortages become severe, the more different types of food become fungible.
You might think this happens only in extreme cases, but as a "poor" Uni student I don't remember eating expensive food very often. And I was living in one of the richest countries on earth.
Single parents, people in disadvantaged communities etc., even in first-world countries, have the problem of putting food on the plate, and they don't really have the luxury to think about what type of food that is.