Nutritional and greenhouse gas impacts of removing animals from US agriculture

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5715743/

In the simulated system with no animals, estimated agricultural GHG decreased (28%), but did not fully counterbalance the animal contribution of GHG (49% in this model). This assessment suggests that removing animals from US agriculture would reduce agricultural GHG emissions, but would also create a food supply incapable of supporting the US population’s nutritional requirements.

Assuming agricultural emissions account for 9% of total US emissions (47), and assuming that emission estimates here are representative of national emissions, eliminating animal agriculture would decrease total US emissions by an estimated 2.6 percentage units.