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Glossary of Environmental Terms X Y Yard Waste: The part of solid waste composed of grass clippings, leaves, twigs, branches, and other garden refuse. Yield: The quantity of water (expressed as a rate of flow or total quantity per year) that can be collected for a given use from surface or groundwater sources. Z Zero Air: Atmospheric air purified to contain less than 0.1 ppm total hydrocarbons.
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