whatever helps you sleep at night.
I dont see how environmentalism has any over lap with eating meat when the usage of water and natural resources to create meat far out ways that when you eat the same nutrition through plants.
When you have a balanced diet without added suffering, not doing so is morally dubious.
(If you live in a western 1st world country this is possible but it depends on each individual situation)
That said. Any reduction in consumption of animals is better for the planet and in almost all cases better for your diet as well.
But vegans in the west really need to consider the impact an imagined future utopia without any meat eating would have on other economies globally.
60% of sub-Saharan Africa's land is really only usable for raising livestock, for example. Of course the very real potential for human suffering as a result of the economic fluctuations that would inevitably come from removing meat from all diets is seldom what people are talking about when they say "suffering" is involved in our consumption of foods, but it's an important consideration.
From what we know, reduction of meat eating is better for the environment and the global economy rather than its elimination entirely. So good on vegans for taking a hit where some of us can't, but this idealized future some seem to have where no one is eating meat is not remotely sustainable now and might never be.