Maybe YOU don't have to eat animals to survive. What a privilege u you have that you live in a place where vegetation can be grown in your area or more likely shipped there cheaply(not free of harm to the environment or people\animals). But your experience is not universal there are places on earth that people live where that is not an option. And some of those people have been living there sustainably for 10s of thousands of years. Not to speak of people who's body needs meat to live because of some other reason. You can not eat animals and that's fine but it doesn't replace the science of how to stop environmental damage.