*Natural Gas - New Perspectives and Future Developments*

**Figure 1.** *Order status of ships using LNG as fuel [1].*

studied in South Korea [3]. There is little research on ship emissions. Especially, emissions from return gas, boil-off-gas are hard to evaluate

In this study, we evaluated the environmental impact of the whole process for Well-to-Hull. It analyzes and evaluates the environmental problems arising from each process of the product through evaluation, including the production and transportation of fuel used for ships as well as operation and compared fossil fuels with natural gas [4]. Therefore, it is necessary to compare and analyze the WTP (Well to Pump) process using GREET. Generally, natural gas occurs greenhouse gas in the WTP than diesel due to the amounts of leakage generated during the production and treatment process. Nevertheless, the greenhouse gases produced during transportation are expected to be good enough to reduce the shortcomings because of the pump-to-hull process. A more detailed comparison of the operation part is needed through WTP analysis using GREET. The PTH result is obtained from the emission information in operating. There are many limitations to conducting experiments using large marine engines. Therefore, the PTH is calculated from an engine specification that is operated in ships (Ilshin Shipping and Incheon Port Authority).
