It would be interesting on several levels if sustainable per-capita meat consumption could be quantified in a sensible way. In a perfect world, a person would only eat as much meat as is necessary for health and well-being (some would argue that we don't actually need to eat meat at all; personally, I tend towards veganism but I don't think that humans are vegans per se).
But there are too many of us (7.4 billion), too many farting cows out there (1.47 billion), and waaaay too much industrial-level "farming" polluting the groundwater and using land that could be used for veggies.
So: If all meat production world-wide was sustainable, how much meat per person would be available? Let's assume that everyone is an omnivore, and that sustainable animal farms use local feed and don't produce more slurry than the ground can cope with.
Can anyone help put a reasonable number on this? I'm thinking along the lines of "x kg per year per person". I guess it will be small number, much smaller that the current per-capita estimates (ca. 60 kg per head in Germany), and might help people make day-to-day decisions regarding their meat consumption.