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Toxic or hazardous substances, such as asbestos, benzene, beryllium, mercury, polychlorinated biphenyls, and vinyl chloride, not listed in the original Clean Air Act because they were not released in large quantities; also called noncriteria pollutants.

Also known as UNESCO, a specialized agency of the United Nations,
established in 1945, serves to contribute to peace and security by promoting
international collaboration through education, science, and culture in order to
further universal respect for justice, the rule of law, and the human rights
and fundamental freedoms proclaimed in the UN Charter.

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Also known as UNEP, the group that coordinates United Nations
environmental activities covering a wide range of issues regarding the
atomosphere, marine and terrestrial ecosystems, founded in December 1972,
headquartered in Gigiri, Nairobi, Kenya

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The science of managing and directing city growth.

 An increasing concentration of the population in cities and a transformation of land use to an urban pattern of organization.

A philosophy that resources should be used for the greatest good for the greatest number for the longest time.