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A term with Biblical origins, often misused these days to refer to a merely worldly phenomenon - that of '''environmental pollution'''. While the physical pollution of the planet is a real problem, '''moral pollution''' has been recognized since the earliest times as the single greatest danger facing mankind, refering as it does to the pollution of men's souls with ungodliness.

''Pollution'' is contamination of a system with harmful foreign components.<ref>http://www.m-w.com/cgi-bin/dictionary?book=Dictionary&va=pollution</ref>. The most common usage of the word pollution refers to [[environmental pollution]], which is contamination of the air, ground, or water with harmful chemicals. A less common use is noise pollution, which is "contamination" of a quiet space by annoying sounds.