According to an article by Mic.com, a recent study published in Climatic Magazine found that vegetarians contribute significantly less to climate change than their meat-eating peers, and vegans have an even smaller environmental footprint.
The article explains the reason for these differences: ‘Meat tends to produce much more emissions than growing plants. That’s thanks in large part to livestock methane emissions and the inefficiency inherent in raising animals. (You need to grow, transport and store food for the animals and then raise, transport and store the meat from the animals themselves.)’
Clearly, there is no such thing as “sustainable” meat, and plant-based alternatives to meat, dairy, and eggs take a mere fraction of the resources to produce as their animal-based counterparts.