"GHG emissions in kilograms of carbon dioxide equivalents per day (kgCO2e/day) were 7.19 (7.16, 7.22) for high meat-eaters ( > = 100 g/d), 5.63 (5.61, 5.65) for medium meat-eaters (50-99 g/d), 4.67 (4.65, 4.70) for low meat-eaters ( < 50 g/d), 3.91 (3.88, 3.94) for fish-eaters, 3.81 (3.79, 3.83) for vegetarians and 2.89 (2.83, 2.94) for vegans"
I think this study does not address my point and includes dairy products as their partial footprint of growing cow. The problem is: no meat, no milk.
The low footprint of vegetarianism only works as long as there are meat eaters eating the "milk cows". If everyone stopped eating meat, the dead cows would end up on the vegetarian's bill. I hope this doesn't sound stupid and you get my twist :)
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4372775/
I don't know what reduction is enough.