1.ANIMAL RIGHTS - We don't need to kill animals to get all the nutrients we need? True. We don't need to exploit animals for dairy products, eggs etc.? True. Very compelling for anyone who believes in the dignity of our fellow inhabitants of this planet.
2.HEALTH BENEFITS -
A vegetarian or vegan diet means you get a lot of the beneficial effects of vegetables like fibre and a reduced dose of the detrimental effects of cholesterol. This is to list a few of the very extensively studied benefits of a veg diet.
4.METHANE IS A GREENHOUSE GAS MORE POTENT THAN CO2 - Cows release methane into the atmosphere due to their digestive processes (...if you know what I mean...) and the livestock industry is the world leader in methane emissions