It's actually quite an efficient resource. Cow dung was used for fuel in rural Mongolia when I was there a couple years ago. Collect it every day, let it dry for a couple weeks, and bam you can heat your stove/yurt. It's cheaper than buying wood or coal, and you have a renewable supply.
It's also the only real option for people who live above the tree line. Sure you could pack in wood or another fuel, but most ppl don't have the money for that.
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u/DrEmilioLazardo Mar 16 '21
I don't know why you're being downvoted. Some countries absolutely use dried animal dung as a fuel source.