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| a nonrenewable energy resource formed from the remains of organisms that lived long ago; examples include oil, coal, and natural gas |
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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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| a gradual increase in average global temperature |
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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 process in which the materials of Earth's surface are loosened, dissolved, or worn away and transported from one place to another by a natural agent, such as wind, water, ice, or gravity |
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| the process of clearing forests |
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| the variety of organisms in a given area, the genetic variation within a population, the variety of species in a community, or the variety of communities in an ecosystem |
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| the death of every member of a species |
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| the process of recovering valuable or useful materials from waste or scrap; the process of reusing some items |
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| a form of tourism that supports the conservation and sustainable development of ecologically unique areas |
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