Plastic product consumption and disposal are widespread. Given that these products are derived from crude oil, it is critical to reduce their consumption and effectively recycle plastic waste as recycled resources to achieve a low-carbon society. Japan enacted the “Containers and Packaging Recycling Law” in 2000, encouraging the recycling of plastic packaging and containers. However, material recycling of plastic waste has stalled due to recycling costs and technical challenges. This paper examines and evaluates the transition process and operational status of Japan’s recycling policy for plastic containers and packaging, as well as clarifies the limits of resources recycling. The limits and issues of current identification technology are discussed by analyzing the characteristics of plastic marks and detecting the material compositions of waste samples. The paper also discusses a new sorting technology that uses terahertz waves to improve plastic recycling. This analysis revealed that plastic containers are typically made of two or more plastic materials, which makes resources recycling more difficult. Terahertz waves are safer than other high-accuracy sorting technologies currently in use. Thus, material recycling can be expanded by accurately analyzing the composition of plastic waste and introducing sorting devices appropriate for achieving the circular economy with sustainable resource recycling.

From the 2020 academic year, new courses of study were introduced in Japan, and the necessity of SDG education was newly specified in them. Therefore, in this study, Miyagi Prefectural Shiroishi High School was selected as a case study as it is conducting community-based SDG education in the Tohoku region, which has problems with sustainability, and the educational effects and changes in awareness before and after SDG education were examined. The purpose of this study is to analyze examples of SDG education practice at Miyagi Prefectural Shiroishi High School based on a case analysis of educational practices related to SDGs that clarifies what changes have been introduced to teachers and students via SDG education, and we suggest activities that are beneficial to both teachers and students. The survey was conducted in a questionnaire format before and after SDG education, and a five-point scale was used to confirm the significance of the change. As a result of SDG education, students became interested in social issues in collaboration with local governments, companies, and schools, and teachers were able to cover specialized content that was difficult without any stakeholders.

Declining birthrates and aging populations are progressing globally, but this trend is particularly prominent in East Asia. Japan and South Korea face SDG-related problems, such as declining birth rates, aging populations, and depopulation in rural areas due to population concentration in urban areas. In this study, “regional revitalization” was set as a keyword for solving SDG-related issues in Japan and South Korea to conduct a comparative analysis of the relevant trends and characteristics of national policies and educational approaches in Japan and South Korea through a literature review. A comparative analysis of the policies and educational approaches to regional revitalization in Japan and South Korea reveals that policies and education are closely related to regional revitalization. Japan aims to increase the permanent population of young people through creating attractive regions in each region, and South Korea aims to alleviate the labor shortage caused by the declining population with labor immigration and aims for regional revitalization via comprehensive cooperation among its own citizens, immigrants, and people with multiple cultures.