Emphasis on the evirnomental aspect added to opening sentences. The text was already present but lower down the article.
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[[File:CP-SLOPE-wb-gantry-power-supply-transformer-PCB-warning.jpg|thumb|upright|PCB warning label on a power transformer known to contain PCBs]]
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[[File:CP-SLOPE-wb-gantry-power-supply-transformer-PCB-warning.jpg|thumb|upright|PCB warning label on a power transformer known to contain PCBs]]
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”’polychlorinated biphenyl”’ (”’PCB”’). PCB’s are a highly toxic product whose production was banned by United States federal law in 1978, and by the [[Stockholm Convention on Persistent Organic Pollutants]] in 2001. It is an [[organochloride|organic chlorine compound]] with the formula [[Carbon|C]]<sub>12</sub>[[Hydrogen|H]]<sub>10−”x”</sub>[[Chloride|Cl]]<sub>”x”</sub>. Polychlorinated biphenyls were once widely deployed as [[dielectric]] and [[coolant]] fluids in electrical apparatus, [[carbonless copy paper]] and in heat transfer fluids.<ref name=Ullmann>{{Ullmann|doi=10.1002/14356007.a06_233.pub2 |title=Chlorinated Hydrocarbons |year=2006 |last1=Rossberg |first1=Manfred |last2=Lendle |first2=Wilhelm |last3=Pfleiderer |first3=Gerhard |last4=Tögel |first4=Adolf |last5=Dreher |first5=Eberhard-Ludwig |last6=Langer |first6=Ernst |last7=Rassaerts |first7=Heinz |last8=Kleinschmidt |first8=Peter |last9=Strack |first9=Heinz |last10=Cook |first10=Richard |last11=Beck |first11=Uwe |last12=Lipper |first12=Karl-August |last13=Torkelson |first13=Theodore R. |last14=Löser |first14=Eckhard |last15=Beutel |first15=Klaus K. |last16=Mann |first16=Trevor |isbn=3527306730}}</ref>
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Because of their longevity, PCBs are still widely in use, even though their manufacture has declined drastically since the 1960s, when a host of problems were identified.<ref>{{cite book |editor1=Robertson, Larry W. |editor2=Hansen, Larry G. |title=PCBs: Recent advances in environmental toxicology and health effects |date=2001 |publisher=University Press of Kentucky |location=Lexington, KY |isbn=978-0813122267 |page=11}}</ref> With the discovery of PCBs’ environmental [[toxicity]], and classification as [[persistent organic pollutant]]s, their production was banned by United States federal law in 1978, and by the [[Stockholm Convention on Persistent Organic Pollutants]] in 2001.<ref>{{cite journal |doi=10.1136/oem.59.10.651 |title=Implementing the Stockholm Treaty on Persistent Organic Pollutants |year=2002 |last1=Porta |first1=M. |last2=Zumeta |first2=E. |journal=Occupational and Environmental Medicine |volume=59 |issue=10 |pages=651–2 |pmid=12356922 |pmc=1740221}}</ref> The International Agency for Research on Cancer (IARC), rendered PCBs as definite carcinogens in humans. According to the [[U.S. Environmental Protection Agency]] (EPA), PCBs cause cancer in animals and are probable human carcinogens.<ref name=”EPA”>{{cite web |url=https://19january2017snapshot.epa.gov/pcbs/learn-about-polychlorinated-biphenyls-pcbs_.html#healtheffects |title=Health Effects of PCBs |publisher=U.S. Environmental Protection Agency (EPA) |location=Washington, D.C. |date=2016-09-15}}</ref> Many rivers and buildings, including schools, parks, and other sites, are contaminated with PCBs and there has been contamination of food supplies with the substances.
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Because of their longevity, PCBs are still widely in use, even though their manufacture has declined drastically since the 1960s, when a host of problems were identified.<ref>{{cite book |editor1=Robertson, Larry W. |editor2=Hansen, Larry G. |title=PCBs: Recent advances in environmental toxicology and health effects |date=2001 |publisher=University Press of Kentucky |location=Lexington, KY |isbn=978-0813122267 |page=11}}</ref> With the discovery of PCBs’ environmental [[toxicity]], and classification as [[persistent organic pollutant]]s, their production was banned by United States federal law in 1978, and by the [[Stockholm Convention on Persistent Organic Pollutants]] in 2001.<ref>{{cite journal |doi=10.1136/oem.59.10.651 |title=Implementing the Stockholm Treaty on Persistent Organic Pollutants |year=2002 |last1=Porta |first1=M. |last2=Zumeta |first2=E. |journal=Occupational and Environmental Medicine |volume=59 |issue=10 |pages=651–2 |pmid=12356922 |pmc=1740221}}</ref> The International Agency for Research on Cancer (IARC), rendered PCBs as definite carcinogens in humans. According to the [[U.S. Environmental Protection Agency]] (EPA), PCBs cause cancer in animals and are probable human carcinogens.<ref name=”EPA”>{{cite web |url=https://19january2017snapshot.epa.gov/pcbs/learn-about-polychlorinated-biphenyls-pcbs_.html#healtheffects |title=Health Effects of PCBs |publisher=U.S. Environmental Protection Agency (EPA) |location=Washington, D.C. |date=2016-09-15}}</ref> Many rivers and buildings, including schools, parks, and other sites, are contaminated with PCBs and there has been contamination of food supplies with the substances.
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