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|areas where cities have grown so large they run into each other.
|countries seeking to industrialize, but still wanting to follow traditional ways.
|like the united states, have long been industrialized and can offer a higher standard of living- the measure of a person's wealth and personal well-being.
|is one of the by-products of a growing world population.
|special environments required for particuar organisms to live.
|the turning of fertile land into desert.
|growing just enough food to meet their needs.
|the rundown, poverty stricken portions of a city.
|reasources that can not be replaced.
|poisonous downpours have killed forests in both north america and europe.
|the gases trap solar energy inthe formof heat.
|the gases used in aerosols, air conditioning, redrigerators, and foam packaging.
|absorbs most of the suns cancer-causing ultraviolet radiation.
|starts to appear each august and reaches its largest size by october.
|economic development that does not limit the ability of furture generations to meet their needs.
|provided new strains of rice, corn,and other grains that have high yeilds