Cereals and carbohydrates had the smallest footprints, with each pound of food releasing only 3 lb of greenhouse gases and almost no nitrogen pollution.

谷物和碳水化合物的足迹最小，每磅食物只释放3磅温室气体，几乎没有氮污染。

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noting that cows produce 13 to 30 lb. of carbon dioxide per pound of meat.

他还提到，牛每长一磅肉，要产生13到30磅的二氧化碳。

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