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。
Cereals and carbohydrates had the smallest footprints, with each pound of food releasing only 3 lb of greenhouse gases and almost no nitrogen pollution.
这其中一部分来自石油或煤炭一类的燃料，但超过70％的氮污染和食物有关。
Some of that comes from fossil fuels like oil and coal. But more than seventy percent involves food.
巴克提到饲养动物作为食物是二氧化碳的一种主要来源，并且是甲烷和氧化亚氮排放的唯一主要来源。
Barker noted that raising animals for food is one of the largest sources of carbon dioxide and the single largest source of both methane and nitrous oxide emissions.
应用推荐