据估计，生产单位卡路里热量的牛肉，需要八倍以上的谷物饲料，而且肉类消费的增长会引起对谷物需求的乘数效应。
Producing a single calorie of beef can, by some estimates, require eight or more calories of grain feed, and expanded meat consumption therefore has a multiplier effect on demand for grains.
收入的增加使人们吃得更多，对肉类的消费大大增加，从而加大了对谷物供应的消耗，因为6磅的饲料只能生产1磅的肉。
That, in turn, has helped to squeeze the world's supply of grain, since it takes about six pounds of animal feed to produce a pound of meat.
在在对动物饲料和饮用水资源污染界面作用的动物，动物产品和人类消费并没有多大影响。
The role of animals at the interface of the contamination of resources for animal feeding and drinking, and human consumption of animal products has been little studied.
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