What about leaving everyone to their individual choice on what they want?

We are omnivores- eat a mix of plant and animal. There is a reason food pyramid exists.

BTW, people in Burundi eat a diet that is 95%+ plant based and are one of the lowest meat consumers per capita in the world. However, Burundi is one of the most de-forested countries in the world. Suggesting that if the world become vegetarian we will have a green world around us is a fallacy.