There is the elephant in the room; the majority of land dedicated to agriculture, that's both land for grazing and land for growing food, is dedicated to raising and feeding animals. I think the number is around 80%, with the amount of land dedicated to growing food is somewhere around 45%?

We're wasteful with vegetables and the like already, when we are wasteful with meat, we're also throwing away all the input that went into the chain prior to it.

I don't like to dictate what people should eat. I was born and raised a lacto-ovo vegetarian, and nowadays I'm almost entirely plant based. Switching over to a plant based diet was easy for me, there wasn't much to switch out. I also in general loathe when people try to fuss over others food, I was on the receiving end of that all the time as a kid and it's incredibly tiring.

That said, reducing our dependence on animal agriculture would be a boon to the world.