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 Definition Any substance introduced into the environment that adversely affects the usefulness of a natural resource or the health of humans, animals, or ecosystems. [d] [e]

Wikipedia has an article of the same name

I was not a contributor to the WP article. I have completely re-written, re-formatted and greatly expanded the WP article before uploading it here as a CZ article. Milton Beychok 07:58, 21 February 2009 (UTC)

Other subpages

Its almost midnight here. I will work on the creating the other subpages tomorrow. Milton Beychok 08:00, 21 February 2009 (UTC)

Subpages created. Milton Beychok 20:33, 21 February 2009 (UTC)