Being a vegetarian may be a great way to reduce CO2 emissions. The meat industry is the main reason of the big air toxicity we have. Plus, many people who claim to be a vegetarian, felt way more healthier than before. Not eating meat (specially beef) lowers the emission of carbon dioxide.
As a  conclusion, I would recommend becoming vegetarian if you really want to lower your carbon footprint because it helps the earth, and you get a benefit as well.

Meat is BIG industry, it's such a shame! We are not vegetarian but have more of a paleo diet. We are careful to source our meats from local farmers.

I have found that any person can become vegetarian, whether he wants or is forced. Since I started taking a diet that consists of dissociating the four days: proteins, starch, carbohydrates and vitamins. But I rely more on dairy and cheese, the meat disappearing from my menu without realizing it. This would help people to live healthier, especially as the Romans face daily with fast-food that influences their lives like KFC and McDonald's.

I disagree with eating an all vegetarian diet for reducing carbon emissions. According to The Washington Post, if Americans changed into an all vegetarian diet "Americans  would increase energy use by 38 percent, water use by ten percent and greenhouse gas emissions by six percent," according to the paper. Yes, vegetarian diets are good if you are speaking on animal cruelty terms, but if we are discussing greenhouse gasses, it actually increases it. But, according to the same article, reducing beef intake would be very beneficial because it takes a lot of land resources to produce a pound of beef, and the amount of methane that is released while producing it is high. Overall, the best diet to reduce greenhouse emissions, is not a vegetarian one, but one without red meat.
Source:
https://www.washingtonpost.com/news/won … c4ffd6c38b