I would definitely go vegan if I thought it would save the planet. I did, in my 20s. Unfortunately it doesn't, won't, and never has been the issue. There are too many of us, and monoculture crops + factory farming are both detrimental. I eat solely meat from regenerative and local farms, and it's a much better solution than my dalliance with veganism, which ruined my health and deluded me into fits of self-righteous superiority about my diet. We have too many humans. Vegetarianism is more likely to lead to more rather than fewer of us...as in India and to some extent China. But why bother arguing? It's less about diet than ideology and phases of life.