**2.1 LCA**

LCA (life cycle Assessment) is developed and utilized by many companies, and research institutes around the world in the 1970s to compare and analyze the environmental friendliness of products [5]. The process in LCA is described in **Figure 2**. It is

*Comparative Life Cycle Assessment of Liquefied Natural Gas and Marine Fuel for Ship… DOI: http://dx.doi.org/10.5772/intechopen.100598*

possible to analyze and evaluate the environmental problems caused by the process of the product, and it is possible to perform a comparative analysis of the products.
