The study has estimated the reduction in the net fisheries’ revenue due to the plastic stock and annual flow into the fishing zone/Thai Exclusive Economic Zone (EEZ) (Gulf of Thailand). This brief has also analysed the benefits of an initiative started in Thailand to reduce the amount of marine plastic in the sea, called ‘return garbage to the shore’. Finally, the case study also discusses the impact of marine plastics on natural assets, marine biodiversity, and ecosystems.