Person: *is going vegan for the good of the planet*
NOOOOOO please, you have to do it because you WANT to, because you don't like meat and dairy and honey and stuff, otherwise you'll just be making yourself sad for very little impact! What you eat has a huge effect on how you feel in your body/mind/heart, and only powerful institutions can cause the kind of industrial change we need anyway.
Instead, maybe every time you eat a cheeseburger you take part in some kind of environmental activism?