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Megalopolises Area where cities have grown so large they run into each other.
Developing countries Countries seeking to industrialize , but still wanting to follow traditional ways.
Developed countries The United States have long , been industrialized and can offer a higher standard of living.
Deforestation The clearing of Deforestation is one of the by-products of a growing world population.
Habitats Special environment required for particular organisms to live.
Desertification Organizing grasslands and overplanting fields leave the land exposed to erosion.
Acid rain Poisonous downpours have killed forest in both North America and Europe.
Green house effect The gases trap solar energy in the form of heat , the same way the nursery greenhouse dose.
Chlorofluorocarbons (CFCs) , the gases used in aerosols, air conditioning , refrigeration , and foam packaging , has also raised concern among scientist.
The ozone hole This hole starts to appear each August and reaches its largest size by October.
The ozone layer Absorbs most of the suns cancer - causing ultraviolet radiation.
Sustainable development Economic development that dose not limit the ability of future generation to meet their needs is known as sustainable development.
Green revolution Provided new strains of rice, corn, and other grains that have high yields.
Subsistences farmers, growing just enough food to meet their needs.
Slums The rundown , property-stricken portion of a city.
Nonrenewable resources Such as coal , petroleum, or natural gas. It takes millions of years to produce these fuels.