来自《耶鲁大学开放课程：有关食物的心理学、生物学和政治学 第10集》

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  The amount of oil that it takes to produce, in this case,
  需要用多少石油用于生产 在这里
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  corn in Nebraska if it's fed by rain,
  内布拉斯加的玉米若用雨水灌溉
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  or irrigated is much different;
  灌溉情况就大不一样了
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  so the irrigation is using oil resource and
  因为人工灌溉需要使用石油资源
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  not only using up the water but the oil resources as well
  不仅仅需要用水而且也要用到石油资源
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  to irrigate the corn because of the machinery involved,
  因为灌溉涉及到用机械设备
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  the pumping water long distances, etc.
  把水从远处抽上来 等等
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  Of course the yield is greater for the irrigation, the irrigated corn,
  当然这块玉米地因为灌溉而长得很好
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  but the cost is greater in terms of the environment.
  但是环境的成本却更高了
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  And where one comes down on whether it makes sense
  而且对于是否灌溉玉米
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  to irrigate the corn depends on what you care about;
  取决于人们关注什么
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  whether you care about the productivity or
  是关注产量