Increasingly significant amounts of waste are being dumped into the sea, with marine pollution becoming an ever more serious global issue. However, despite the strengthening of related laws in Korea, the problem is proving difficult to resolve, with detailed plans and alternatives yet to be proposed. According to national monitoring data, on average plastic waste accounts for more than 53.5% of all Korea’s environmental pollution over the past seven years. Accordingly, we conducted a study on current levels of marine plastic waste to predict how much it would increase over the next five years. Based on national coastal waste monitoring statistics, the ratio of each material was calculated and compared with real levels of collected coastal waste. Afterward, the trend line was used to predict the amount of plastic waste for the next five years, with carbon emission levels from recycling and incineration calculated through LCA. As a result of the study, the total amount of marine plastic waste collected over the five years beginning from 2023 was predicted to be 461,156 tons. After calculating the carbon emissions for each material and comparing those of recycling and incineration, it was deemed possible to reduce emissions by about 3.35E+05 tons/CO2 per year. This figure is equivalent to the amount of carbon that could be absorbed by an area of pine trees half the size of Seoul and about 36.6 times the size of Yeouido in one year. This study is expected to serve as basic data a