原因有好几个：一些人怀疑生物燃料到底是不是所谓的绿色能源，有人说生产过程中耗费的能源就已经跟这些产品燃料能产生的能量差不多了。
There are doubts about how green ethanol really is (some say the production process uses almost as much energy as it produces).
生产过程和空间安排在椭圆形围合的绿色内庭院里，圆形露台可以举办如品尝聚会的活动。
Production process and spaces are arranged in an ellipse enclosing an inner green courtyard with a circular patio for events like tasting sessions.
绿色和平组织最近发布了最新版本《环保电子指导书》(Guide to Greener Electronics)，书中将各大高科技企业按生产过程中产生的污染水平进行分级排名。
Activist group Greenpeace has released a new edition of its Guide to Greener Electronics, which ranks major high-tech corporations in terms of their alleged environmental friendliness.
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