Earlier quoted context omitted.
No one's disputing the footprint, they're disputing how feasible it is for all or even most people. Vegetarianism requires much more understanding and planning to ensure you ingest sufficient proper macro and micronutrients. Edit: and you need look no further than Harvard's explanation of how to become a vegetarian and choose your foods to ensure a healthy diet: https://www.health.harvard.edu/staying-healthy/becoming…
Eating a healthy diet takes work no matter what diet plan you follow. You're assuming a meat-based diet is automatically healthy when in fact the typical meat based, western diet is strongly linked to all of our most deadly diseases. You're going to be a lot better off on an even non-ideal plant based diet than you are going to be eating hamburgers and pizza. I'll admit it's currently not that easy to follow a strict…
I'm asserting that it's harder to be nutrient deficient given a meat/fish-based diet. The only "work" in this diet is not eating too much.
> western diet is strongly linked to all of our most deadly diseases
Mostly due to overconsumption, not due to the composition of the diet. Controlling for caloric intake eliminates most differences in health outcomes between the various diets, assuming no nutrient deficiencies are present.