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|Area where cities have grown so large they run into each other.
|Countries seeking to industrialize , but still wanting to follow traditional ways.
|The United States have long , been industrialized and can offer a higher standard of living.
|The clearing of Deforestation is one of the by-products of a growing world population.
|Special environment required for particular organisms to live.
|Organizing grasslands and overplanting fields leave the land exposed to erosion.
|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.
|Economic development that dose not limit the ability of future generation to meet their needs is known as sustainable development.
|Provided new strains of rice, corn, and other grains that have high yields.
|growing just enough food to meet their needs.
|The rundown , property-stricken portion of a city.
|Such as coal , petroleum, or natural gas. It takes millions of years to produce these fuels.