The Eco-Picture Diary Environmental Education Project (EDEEP) was developed and introduced by Recycle Design, a Yokohama-based civil society organization, to inform students, their family members, and other citizens about particular socio-environmental issues and strategies in Yokohama City, Japan. EDEEP was a contributing factor to the success of the city’s Garbage-30% (G-30) program, which helped reduce garbage waste production by 43% in 2010. 

This case study shows (1) how Yokohama citizens perceived EDEEP’s effect on the G-30 garbage reduction program; (2) how project stakeholders perceived EDEEP as an instructional tool using place-based approaches to environmental education, ecopedagogy, reflective learning, and backcasting; and (3) how the project became popular via the diffusion of innovation theory and the theory of planned behavior (Hiroshi and Reid, 2020).