For every 100 calories of grain fed to farmed animals, you only get:

https://abs.twimg.com/emoji/v2/... draggable="false" alt="🥛" title="Glass of milk" aria-label="Emoji: Glass of milk"> 40 calories of milk
https://abs.twimg.com/emoji/v2/... draggable="false" alt="🥚" title="Egg" aria-label="Emoji: Egg"> 22 calories of eggs
https://abs.twimg.com/emoji/v2/... draggable="false" alt="🐔" title="Chicken" aria-label="Emoji: Chicken"> 12 calories of chicken
https://abs.twimg.com/emoji/v2/... draggable="false" alt="🐖" title="Pig" aria-label="Emoji: Pig"> 10 calories of pork
https://abs.twimg.com/emoji/v2/... draggable="false" alt="🐄" title="Cow" aria-label="Emoji: Cow"> 3 calories of beef

This is an extravagantly inefficient way to feed the world. https://www.nationalgeographic.com/foodfeatures/feeding-9-billion/">https://www.nationalgeographic.com/foodfeatu...

The protein conversion efficiencies is just as troubling:

"(G)rowing food exclusively for direct human consumption could...increase available food calories by as much as 70%, which could feed an additional 4 billion people (more than the projected 2–3 billion people arriving through population growth)."
https://iopscience.iop.org/article/10.1088/1748-9326/8/3/034015/meta">https://iopscience.iop.org/article/1...

Farming that imitates natural ecosystems is how it can be done in the most sustainable & regenerative manner, although simply switching to a focus on diverse plant-based farming is also a massive improvement. https://twitter.com/NicholasDCarter/status/1160238999027326977?s=19">https://twitter.com/NicholasD...

Even if a fraction of cropland used for animal feed is transitioned to cropland for human food, we& #39;d get a massive increase in food supply.

The evidence for this is clear in this Harvard study by @HHarwatt & @MattHighKick http://animal.law.harvard.edu/wp-content/uploads/Eating-Away-at-Climate-Change-with-Negative-Emissions%E2%80%93%E2%80%93Harwatt-Hayek.pdf">https://animal.law.harvard.edu/wp-conten...