苏巴克把所有因素加在一起，发现采用围栏饲养或集中饲养（concentratedanimalfeedingoperation，CAFO）模式，每生产1千克牛肉，会产生14.8千克二氧化碳当量的温室气体，是芦笋生产的36倍以上。
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That's what happened in 2000. Someone reported pollution from one of the CAFOs to state authorities and the CAFO operator blamed Henning.
VOA: standard.2010.05.06
The several hundred animals housed in each medium-sized CAFO produce as much waste as a small city of tens of thousands of people.
VOA: standard.2010.05.06
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