在分析目前煤炭环境成本构成的基础上，对煤炭环境成本的构成要素进行了完善与规范。
Based on discussing the structure of coal environment costs, the elements that composed the coal environment costs are analyzed.
企业在经济活动中常常只追求内部经济性，滥用环境而不构成成本，将外部不经济性留给社会。
In their economic activities, enterprises often seek after only the inner economy, abuse environment without incurring any cost, and leave the outer economy to the society.
如何有效地处置日益增加的污泥，既不使成本过高，又不对环境构成二次污染，是环境工程界最为关注的课题之一。
How to effectively disposal increasing sludge, neither make cost is exorbitant, and no environment form secondary pollution, environmental engineering is one of the most attention subject.
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