Grazing is terrible for the environment

Why do you say this?

and crops are specifically grown as animal feed

Generally speaking, this is untrue. A small number of crops are grown as animal feed, but it's a waste of money to grow human edible crops for a majority of the animal feed cycle. As I said above, 86% of animal feed is inedible to humans, and a majority of the remaining 14% are dead calories.

It wouldn’t be destroyed or burned because it wouldn’t be grown at all

I guarantee nobody is backing off on growing corn, wheat, rice, or soy right now, even if we suddenly stopped letting anyone eat meat.

Additionally there are plenty of other uses for inedible plant waste other than feeding to animals

Are there? Care to cite which uses exist for feed that are better than the efficient process of using livestock to create some of the objectively highest-quality human-edible calories that exist in nature?