Green waste

Green waste, also known as biological waste or yard waste, is any organic waste that can be composted. It is most usually composed of refuse from gardens such as grass clippings or leaves, and domestic or industrial kitchen wastes. Green waste does not include things such as dried leaves, pine straw, or hay.

Such materials are rich in carbon and considered "brown wastes," while green wastes contain high concentrations of nitrogen.
Green waste can be used to increase the efficiency of many composting operations and can be added to soil to sustain local nutrient cycling.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY 2.0

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