zero discharge. No measurable emissions from a defined source. zero emissions. See zero discharge. zero population growth. An often-stated goal of some environmentalists that the human population of the world be stabilized at its current level. zero-revenue auction. An auction designed to allocate assets or property rights among f m or users where the revenue collected from the auction is subsequently retumed to owners of the newly acquired assets. zero sum game. A mathematical construction of a set of choices where the outcomes are symmetrically opposed such that the total benefits received by one party are equivalent to the losses borne by the other. See non-zero sum game. zero wealth effects. An assumption made under the Coase Theorem that, in the absence of property rights, creating and giving a property right to any one party does not affect the wealth of any of the parties, and thus does not affect the ability of the parties to reach the efficient outcome. See Coase Theorem. zoning. Collective term for regulations that govern the permitted land use in defined areas. Zoning can be used to conserve green spaces within urban environments and to prevent industries from setting up their operations in residential neighborhoods. zoogeography. The study of the spatial distribution of animals. zoology. The study of animal life. zooplankton. Plankton consisting of small creatures that include the juvenile stages of many larger aquatic creatures. See-plankton and phytoplankton. 309 This page intentionally left blank
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