It's interesting, even just cutting out farmed ruminant meat from one's diet - a tiny cut compared to other diets - noticing just how much food has beef in it.
(I'm avoiding farmed ruminant meat in an attempt to reduce my carbon footprint, as farmed ruminant meat has by far the worst carbon footprint of most calorie sources. Exceptions are if the food would be wasted otherwise (the carbon has already been emitted), and wild ruminant meat reduces, not increases carbon footprint.)
The reason why ruminant meat has such a high carbon footprint is the methane emissions of ruminant digestive systems, so a ruminant being alive means it's emitting.
Apparently the carbon footprint of dairy products is actually not too bad - I guess the caloric output is high enough to offset the emissions.
Also, I don't CW food itself, or discussion of foods, but this is about what someone should eat for political/environmental reasons, and that shit gets incredibly preachy.
The source I'm using on the emissions, BTW, is https://earthscience.stackexchange.com/a/10177 - which used the Climate Working Group's Meat Eater's Guide's numbers for embodied CO2 per kg of food product, and FDA numbers for calories per kg of food.
Server run by the main developers of the project It is not focused on any particular niche interest - everyone is welcome as long as you follow our code of conduct!