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Maybe it is a classic case of mixing up causation and correlation. First if all, correlation vs causation. It make sense that climate correlate (and limits) the geography of an empire. Romans had a certain diet and technology for agriculture, certain technology for building houses etc that was optimal to Mediterranean climate. They couldn't grow wheat and ...


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About the particular example: Wheat and other grains have high nutrition value and dandelions not. You need to eat several kilo of dandelion to cover your basic calorie needs. 40Cal/100g, that is 400Cal /kg. You need to eat 5 kg if you are an office worker sitting all the day. But most probably you would be pretty sick in the first day if you can finish ...



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