In order to reduce marine litter, it is important not only to continuously collect and dispose of it, but also to promote wide-area measures, including inland areas, to curb the generation of marine litter in collaboration with various actors. Therefore, the Ministry of the Environment has selected a model area and implemented a project to assess the actual situation of inland areas and rivers that lead to marine litter, scattering, drifting, and washed ashore litter, and to verify the effects of measures to reduce the generation of litter through examination and demonstration. doing. The Behavioral Science Laboratory Faculty of Humanities and Human Sciences (Professor Susumu Ohnuma) is participating in this project.