I heard something to do with Nitrogen and …cow farts(?) I am really unsure of this and would like to learn more.
Answer -
4 Parts
- Ethical reason for consuming animals
- Methane produced by cows are a harmful greenhouse gas which is contributing to our current climate crisis
- Health Reasons - there is convincing evidence that processed meats cause cancer
- it takes a lot more calories of plant food to produce the calories we would consume from the meat.
Details about the answers are in the comments
As for methane, one it’s in the atmosphere there’s not much you can do.
As for runoff, the emissions per cow have decreased over the decades. But the amount of cows has far outpaced the decrease in emissions per cow.