Farming plants requires the field become a monoculture with even the insects killed. Cows graze along side the rest of nature until they are slaughtered for tasty steaks. Cows win hands down. So, of all the eating categories there are, this makes Vegans the worst for the environment.
Vegans eat soy grown in plots that used to be pristine rain forest, which were bulldozed and torched in order to feed vegans soy. lol
The environment was made to handle both.