I would agree with one, but not with two. There are many places in the world where the land is not sufficiently arable, and relying on factory farming using chemical inputs is not sustainable. The only way people can survive is for some goat to eat the nutritionless weeds, then they eat the goat. Also without chemical inputs animal husbandry is necessary for fertilizers for sustainable farming. And without access to unsustainable B12 supplements, veganism is not a viable diet. There's a very long unsustainable factory trail behind veganism, which is unacknowledged.