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Yumenoshima: Tokyo Bay Landfill and the Memory of Pollution, 1957–1971 Yumenoshima is a landfill created in Tokyo Bay, Koto Ward, Tokyo. It was used as a final waste disposal site from 1957. At the time, Tokyo was entering a period of rapid economic growth, and the volume of garbage was increasing dramatically. However, the development of waste treatment plants and incineration facilities could not keep pace. Consequently, a method was adopted where food waste was not fully incinerated but simply buried. This led to advanced decay, causing severe environmental pollution: foul odors, massive fly infestations, and spontaneous combustion due to methane gas. The lives of nearby residents were greatly impacted, and Yumenoshima became a symbol of the city's inadequate waste processing capacity. The issues eventually escalated into regional conflict, culminating in the so-called "garbage war" of 1971. This became a turning point, forcing a reevaluation of waste management policies
. Subsequently, the landfill transitioned to primarily burying incinerated ash, and environmental measures were strengthened. Today, Yumenoshima Park stands as a quiet place conveying the history of past pollution and the city's learning process.