the action of clearing a wide area of trees., a prolonged period of abnormally low rainfall, leading to a shortage of water., a gradual increase in the overall temperature of the earth's atmosphere generally attributed to the greenhouse effect caused by increased levels of carbon dioxide, chlorofluorocarbons, and other pollutants., the process of making an area more urban., a glacial episode during a past geological period., the covering or submerging of normally dry land with a large amount of water., the presence in or introduction into the environment of a substance or thing that has harmful or poisonous effects.,

Short - Term/Long-Term Environmental Changes

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