>PlanetNot really, but the closet would be planets where life arises on a planet that is close to it's star and perhaps sentient life arises and realizes they don't have much time.
>Veganism If you mean it as a shitpost or pun:
I think veganism has a fair shot of forming their own society but we don't know the long term affects of a vegan diet on a person. In contrast to vegetarianism, veganism is a very new diet being practiced and risks cutting off essential nutrients (like studies suggesting that vitamin D2 isn't absorbed as well as vitamin D3 to the point that vegans in sunny areas sometimes still have vitamin D deficiency) . Though they clearly live long enough to reproduce and can be healthy in many ways compared to an average person who eats processed food.