The Oxford University study dissected the diets of 60,000 individuals – 2,000 vegans, 15,000 vegetarians, 8,000 fish-eaters and close to 30,000 meat-eaters – and found the difference in diet-driven carbon footprints was significant. The Oxford study found that cutting a person’s meat intake could cut a person’s carbon footprint by 35 percent. Go vegan and slash your carbon footprint by 60 percent.