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
IMO what’s bad is not meat consumption itself, which we were able to do sustainably for millennia and it was never really a problem. The problem is that now you’re getting too much of it way too easily. Eating too much meat is a problem because it perpetuates demand for unethical mass-production of meat and livestock are made to suffer as a direct result.
Take a look at the global human population chart over the last few millenia. Things can seem sustainable when there are a million people on the planet. When there are 8 billion things are a bit different.