Pollution is the introduction of contaminants into the natural environment that cause adverse change. Pollution can take the form of chemical substances or energy, such as noise, heat or light. Pollutants, the components of pollution, can be either foreign substances/energies or naturally occurring contaminants. Pollution is often classed as point source or nonpoint source pollution. The Blacksmith Institute issues an annual list of the world's worst polluted places. In the 2007 issues the ten top nominees are located in Azerbaijan, China, India, Peru, Russia, Ukraine and Zambia.

Read more about Pollution:  Ancient Cultures, Official Acknowledgement, Modern Awareness, Forms of Pollution, Pollutants, Sources and Causes, Regulation and Monitoring, Pollution Control, Perspectives, Greenhouse Gases and Global Warming

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Famous quotes containing the word pollution:

    Like the effects of industrial pollution ... the AIDS crisis is evidence of a world in which nothing important is regional, local, limited; in which everything that can circulate does, and every problem is, or is destined to become, worldwide.
    Susan Sontag (b. 1933)