**4. Conclusions**

The research was carried out to investigate the environmental impacts of LNG as fuel, comparing marine fuels. LCA analysis shows that natural gas produces more GHGs in WTP compared to liquid fuel for ships, but fewer in PTH. In the case of pump to hull (PTH), the energy consumption and GHG emissions in operation far exceed the WTP process due to the nature of ships that must cross the Pacific. Therefore, LNG, which emits less GHGs than diesel, is thought to be much better than diesel in terms of the environment but may differ from actual operating conditions, so engine experiments and additional data are needed to confirm in the future.
