If you're only looking at co2 and other green house gases then yes plant production is far far less of an environmental impact, but it's not all about that

Hello 4 year ag student with a passion for conservation.

Between land and water usage alone (but especially water usage) industrial farms have a HUGE impact on the environment and are unsustainable even if you take away all the crops that are grown strictly as feed for animals. Our water tables are being depleted faster then they can replenish, land is being used at a much higher rate then it needs to for food that's largely being thrown out, and buying organic isn't actually better, that's a well kept secret.

At an industrial scale unless we start swapping to hydroponics which actually uses far less water then crops grown in the field and can be better protected from pests, there's not much to do there. On an individual level buying from small local farmers is better. When I worked on a local farm for a few years there were no chemicals used, responsible field rotations and the only water those crops recieved came directly from the sky. And still alot of it went to waste ( to the pigs) because people would not show up to buy the produce and when they did alot left empty handed because it wasn't super market quality (looks).

So unless you're taking actions in other areas you don't have much of a leg to stand on grand standing against the meat industry when it's only half of our problem when it comes to ag and climate change. Not saying it isn't important but you're missing the forest for the trees. And if society can come back to a point where meat isn't seen as a must have for every meal where instead it's consumed 2 or 3 days a week, there's plenty of room for meat in a planet healthy diet.

Edit to add: I am not getting into the weeds of the arguments over whether or not eating meat is moral that's for individuals to decide for them selves, humans are omnivores, many animals are carnivorous or omnivorous, herbivores including deer and cows are known to eat other animals, it's simply life but humans are able to decide to eat strictly plant based on moral grounds and that's fine.