Green Roofs are natural environments located on top of human made structures that took away a piece of nature in the first place.
All natural and living systems (including human bodies) take-up pollutants, ideally transform them into less harmful natural elements, partially accumulated them or release them back into nature. With the end of the lifespan of any living organism or when oversaturated with pollutants, they will be released eventually. Some natural elements (sun, wind, rain) might be able to break down pollutants but most likely transform them into other – sometimes more harmful – elements.
To reduce the release of pollutants it is crucial that the source of pollution is treated or as a temporary solution treatment for the polluted natural bodies. For human there is health care when affected by pollutants. Since all green roofs are connected to a sewer system, the run-off from green roofs is treated in a wastewater facility. For incomplete, misleading headline research without common sense there is the waste paper basket – how the British people would say. In America, experts say simply: trash.