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| a resource that forms at a rate that is much slower than the rate at which the resource is consumed |
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| a natural resource that can be replaced at the same rate at which the resource is consumed |
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| a calculation that shows the productive area of Earth needed to support one person in a particular country |
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| an undesirable change in the natural environment that is caused by the introduction of substances that are harmful to living organisms or by excessive wastes, heat, noise, or radiation |
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| urban air pollution composed of a mixture of smoke and fog produced from industrial pollutants and burning fuels |
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| fine particles that are suspended in the atmosphere and that are associated with air pollution |
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| precipitation that has a pH below normal and has an unusually high concentration of sulfuric or nitric acids, often as a result of chemical pollution of the air from sources such as automobile exhausts and the burning of fossil fuels |
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| the warming of the surface and lower atmosphere of Earth that occurs when carbon dioxide, water vapor, and other gases in the air absorb and reradiate infrared radiation |
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| a gradual increase in the average global temperature that is due to a higher concentration of gases such as carbon dioxide in the atmosphere |
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| An indicator species is any biological species that defines a trait or characteristic of the environment |
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| the accumulation of pollutants at successive levels of the food chain |
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| When a habitat is disturbed, or even made into smaller habitats, it is called habitat fragmentation. A good example of this is when a road is built through a forest, separating it into two. |
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| A species that does not occur naturally in a given area, though has been introduced to it. |
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| development that meets the needs of the present without compromising the ability of future generations to meet their own needs. |
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| species selected for making conservation related decisions, typically because protecting these species indirectly protects the many other species that make up the ecological community of its habitat |
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