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==== Pollution ==== Pollution, the presence of contaminants in an environment that causes adverse effects, could have been present as early as the [[Inca Empire]]. They used a [[lead sulfide]] [[Flux (metallurgy)|flux]] in the [[smelting]] of ores, along with the use of a wind-drafted clay [[kiln]], which released lead into the [[atmosphere]] and the [[sediment]] of rivers.<ref>{{Cite book |last=Smol |first=J. P. |url=https://www.worldcat.org/oclc/476272945 |title=Pollution of Lakes and Rivers : a Paleoenvironmental Perspective. |date=2009 |publisher=John Wiley & Sons |isbn=978-1444307573 |edition=2nd |location=Chichester |page=135 |oclc=476272945 |access-date=14 February 2023 |archive-date=29 April 2024 |archive-url=https://web.archive.org/web/20240429043125/https://search.worldcat.org/title/476272945 |url-status=live }}</ref>
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