My roommate is a vegetarian, because (he claims) that it's more efficient. It takes more energy to raise a cow than raise some corn.
Thoughts?
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This assumes that one is feeding the animals grain, or some other thing that humans can eat. I live on a farm and raise about 90% of the meat we eat. I do not feed those sheep and goats grain; they eat grass and weeds. Humans can not eat grass and weeds, no matter how hard they try or what their convictions are. My land is not suitable for growing grains, but I can grow native grasses and forbs pretty well. This means I can turn a hillside filled with scrub and weeds into lamb chops.
No matter how much energy you put in, there is a lot of land in the world that will not grow corn, or wheat or rice etc. I always thought that by utilizing an efficient grazing animal, such as a goat or a llama, that land can be put to use and provide food. It seems to me that the argument of "it takes more energy" was originally put forward by someone who did not really farm, who lived in a wealthy country and who did not realize that cows can eat grass, too.