No, eating plants is not unethical. This might interest you: http://www.reddit.com/r/askscience/comments/1mdqbr/if_the_worlds_population_became_completely/ ht

No, eating plants is not unethical. This might interest you: http://www.reddit.com/r/askscience/comments/1mdqbr/if_the_worlds_population_became_completely/ http://www.reddit.com/r/askscience/comments/1mdqbr/if_the_wo... The short story is that it takes up more land to feed and house livestock than it does to farm plants. "More than two-thirds of all agricultural land is devoted to growing feed for livestock, while only 8 percent is used to grow food for direct human consumption." Not to mention the amount of water livestock and its feed consumes.