I feel like the beef industry should have started selectively breeding based on gas emissions like 20 years ago. The people want less farty cows, so go engineer them!
Shouldn't we instead focus on a diet that prevents humans from farting?
(Incidentally, I ate no calories from any plant-based source during all of 2021, and an interesting side effect that I noticed (other than spectacular overall health) was that I completely stopped farting. Others who have tried the all-meat diet have also commented on the fact that humans don't fart on an all-meat diet.)
What about 'em? I'll let you do your own research on the methane production from a human vs. a head of cattle. Here, I'll give you a head start: it ain't the farts, so start your search there.
1. https://pubmed.ncbi.nlm.nih.gov/1648028/
2. https://academic.oup.com/jas/article-abstract/73/8/2483/4632...