,At over 12,000 feet above sea level, Puno, Peru, ranks among the highest altitude places in the world. So high, food takes longer to cook here. Puno also sits far above the tree line, so there is little burnable vegetation and residents burn dung from cows, or occasionally alpacas, for cooking fuel, often in poorly ventilated spaces the size of a small closet.
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Source: Phys.org