Resource recycling
Storing rainwater for flushing toilets and watering plants. Efforts to use rainwater to flush toilets have
already been made mainly in urban buildings.
Image from "Figure -1 Definition of Smart Cities in this Interim Report" in Ministry of
Land, Infrastructure and Transport "Toward Smart Cities: [interim report]
(https://www.mlit.go.jp/common/001249774.pdf)".
