Editing Tribute in Light (section)

==Effects on birds==
The [[light pollution]] from ''Tribute in Light'' has caused confusion for over a million migrating birds, trapping them in the beams.<ref name=":0">{{Cite journal |last1=Van Doren |first1=Benjamin M. |last2=Horton |first2=Kyle G. |last3=Dokter |first3=Adriaan M. |last4=Klinck |first4=Holger |last5=Elbin |first5=Susan B. |last6=Farnsworth |first6=Andrew |date=2017-10-02 |title=High-intensity urban light installation dramatically alters nocturnal bird migration |journal=Proceedings of the National Academy of Sciences |volume=114 |issue=42 |language=en |pages=11175–11180 |doi=10.1073/pnas.1708574114 |pmid=28973942 |issn=0027-8424 |pmc=5651764 |bibcode=2017PNAS..11411175V |doi-access=free}}</ref> Even at an altitude of several miles, birds can be affected by the lights.<ref name="perceive"/> As a result of this effect, the beams are switched off for 20-minute periods to allow the birds to escape.<ref>{{cite news |url=https://www.telegraph.co.uk/news/worldnews/northamerica/usa/8005051/10000-birds-trapped-in-Twin-Towers-memorial-light.html |newspaper=Daily Telegraph |title=10000 birds trapped in Twin Towers memorial light |date=September 15, 2010 |access-date=Sep 15, 2010 |location=London |first=Nick |last=Allen |archive-date=September 13, 2017 |archive-url=https://web.archive.org/web/20170913074718/http://www.telegraph.co.uk/news/worldnews/northamerica/usa/8005051/10000-birds-trapped-in-Twin-Towers-memorial-light.html |url-status=live }}</ref> To ensure the lights do not affect migrating birds, the Municipal Art Society works with the [[NYC Bird Alliance]] on the illumination.<ref>{{cite news |url=http://www.crainsnewyork.com/article/20110818/FREE/110819880 |publisher=Crain's |title=Tribute in Light seeks funders |date=August 18, 2011 |first=Emily |last=Laermer |access-date=August 22, 2011 |archive-date=April 3, 2017 |archive-url=https://web.archive.org/web/20170403195807/http://www.crainsnewyork.com/article/20110818/FREE/110819880 |url-status=live }}</ref> A 2017 study found that the installation "dramatically altered multiple behaviors of nocturnally migrating birds—but these effects disappeared when lights were extinguished".<ref name=":0" /><ref>{{Cite news |url=https://www.nytimes.com/2017/10/02/science/september-11-tribute-lights-birds.html |title=Yearly 9/11 Tribute Shows Light Pollution's Effects on Birds |last=Quenqua |first=Douglas |date=2017-10-02 |work=The New York Times |access-date=2017-10-03 |language=en-US |issn=0362-4331 |archive-date=October 3, 2017 |archive-url=https://web.archive.org/web/20171003175351/https://www.nytimes.com/2017/10/02/science/september-11-tribute-lights-birds.html |url-status=live }}</ref>