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将清洁燃料(天然气)的利用与环境结合起来进行研究，是当今世界的前沿科学技术。为了具体说明从天然气开采到使用整个过程中对环境产生的影响，采用生命周期分析的方法对天然气开采、运输、使用等三个阶段中所造成的废弃物排放进行了分析和计算，对整个过程中投入和产出的能量进行了计算，并对天然气合成氨、作为民用燃气、发电、热电联产等天然气利用方法进行了比较。结果表明：与煤、石油等传统能源相比，天然气在各个方面对环境的影响是最小的，是一种理想的清洁能源。

Life Cycle Assessment for Influence of Using Natural Gas on Environment

Studying the use of the clean fuel (natural gas) with the environment is the nowadays leading technology in the world.In order to explain the influence on the environment during the whole process from exploiting to using,the waste emission during exploiting,transporting and using natural gas was analyzed and calculated by means of Life Cycle Assessment (LCA).Then the input and output energy in the total process was calculated.Some methods,such as ammonia synthesized by natural gas,natural gas used as civilian fuel gas,power generating,heat and electricity co generating,etc.were compared as well.The result shows that comparing with the traditional energies,such as coal,oil,etc.,natural gas has the least influence on the environment at various fields,and is an ideal clean energy.