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Pollution is the introduction of contaminants into the natural environment that causes 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. Air pollution has always accompanied civilizations. Pollution started from prehistoric times when man created the first fires. According to a 1983 article in the journal Science, "soot" found on ceilings of prehistoric caves provides ample evidence of the high levels of pollution that was associated with inadequate ventilation of open fires." Metal forging appears to be a key turning point in the creation of significant air pollution levels outside the home. Core samples of glaciers in Greenland indicate increases in pollution associated with Greek, Roman and Chinese metal production, but at that time the pollution was comparatively small and could be handled by nature.
About the author
Dr. Morusu Siva sankar, MBA, M.Sc (IT), M.Tech, M.Com, P h.D en Post Doctoral Fellow (UGC) van de S.V.University. Hij heeft 90 artikelen gepubliceerd in verschillende nationale en internationale tijdschriften en heeft 30 boeken geschreven. Hij heeft papers bijgewoond en gepresenteerd in 36 nationale en 2 internationale seminars. Hij werkt aan de S.V.U. hogeschool voor techniek. Tirupati, A.P.
