Well, I will say that it is correct. But, again, I’m not here to demand you or anyone agree with me. But the actual studies of nutrition and human health are published and available to read worldwide.
As to the current animal husbandry industry, I do agree that as it now exists, it is cruel, inhumane, and polluting. It should be reformed, and pollution controls enacted.
Ad to answering the question of our ecological nightmare…no one has that answer. Just by existing, humanity has destroyed, what 50% of all species on the planet? The few that survive, survive solely because we want them in some capacity. Whether as pets, workers, science subjects, or as food. There is no world in which humanity does not create ecological disaster, there are simply too many of us, and we (overall) have complete disregard for our environment, or even the future health of our own species.
Personally, I believe the problem will take care of itself. Just not in the way you might hope.