Redigerer Utryddelse (avsnitt)

==Referanser==
<references>
<ref name="Allaby (2014)">{{cite book|last1=Allaby|first1=Michael|title=A Dictionary of Zoology|url=https://archive.org/details/dictionaryofzool0000unse_e8q9|date=2014|publisher=Oxford University Press|isbn=9780199684274|edition=4th}}</ref>

<ref name="Bar-On, Phillips & Milo (2018)">Bar-On, Y. M., Phillips, R., & Milo, R. (2018). The biomass distribution on Earth. ''Proceedings of the National Academy of Sciences'', 201711842. https://doi.org/10.1073/pnas.1711842115</ref>

<ref name="Blockstein & Tordoff (1985)">Blockstein, D.E. & Tordoff, H.B. (1985) Gone forever: a contemporary look at the extinction of the Passenger Pigeon. Amer. Birds 39(5): 845–851.</ref>

<ref name="Ehrlich (2017)">Paul R Ehrlich (2017) [https://www.theguardian.com/commentisfree/2017/jul/11/sixth-mass-extinction-habitats-destroy-population You don’t need a scientist to know what’s causing the sixth mass extinction]. The Guardian, 11 Jul 2017. Besøkt 2018-07-08</ref>

<ref name="Halliday (1979)">{{Kilde artikkel|forfatter=Halliday, T.R.|utgivelsesår=1979|tittel=The Great Auk|publikasjon=Oceans|nummer=12|side=27–31|språk=engelsk}}</ref>

<ref name="Henriksen & Hilmo (2015)">Henriksen S og Hilmo O (2015) Utdødde arter i Norge. Norsk rødliste for arter 2015. Artsdatabanken <http://www.artsdatabanken.no/Rodliste/UtdoddeArter {{Wayback|url=http://www.artsdatabanken.no/Rodliste/UtdoddeArter |date=20180708221056 }}>. Nedlastet 2018-07-08.</ref>

<ref name="Myklebust & Stenøien (2016)">Ivar Myklebust og  Hans K. Stenøien (August 12. 2016) [https://forskning.no/biologisk-mangfold-kronikk-naturressursforvaltning/kronikk-verdens-arter-utryddes-1000-ganger-raskere-enn-det-som-er-naturlig/1167296 Kronikk: Verdens arter utryddes 1000 ganger raskere enn det som er naturlig]. forskning.no. Besøkt 2018-07-08</ref>

<ref name="NatGeo (udatert)">NatGeo (udatert) [https://www.nationalgeographic.com/science/prehistoric-world/mass-extinction/ Mass Extinctions]. National Geographic, besøkt 2018-07-08</ref>

<ref name="Petersen (1979">{{Kilde artikkel|forfatter=Petersen, Ævar|utgivelsesår=1995|tittel=Brot úr sögu geirfuglsins|publikasjon=Náttúrufræðingurinn|bind=65|nummer=1–2|side=53–66|språk=islandsk|issn=0369-5921|url=http://timarit.is/view_page_init.jsp?pageId=4259075&issId=290303&lang=4}}</ref>

<ref name="Schulte ''et al.'' (2010)">{{Cite journal| last = Schulte | first = Peter | coauthors = Alegret, Laia; Arenillas, Ignacio; Arz, Jose A.; Barton, Penny J.; Bown, Paul R.; Bralower, Timothy J.; Christeson, Gail L.; Claeys, Philippe;  Cockell, Charles S.; Collins, Gareth S.; Deutsch, Alexander; Goldin, Tamara J.; Goto, Kazuhisa; Grajales-Nishimura, José M.; Grieve, Richard A. F.; Gulick, Sean P. S.; Johnson, Kirk R.; Kiessling, Wolfgang; Koeberl, Christian; Kring, David A.; MacLeod, Kenneth G.; Matsui, Takafumi; Melosh, Jay; Montanari, Alessandro; Morgan, Joanna V.;  Neal,Clive R.; Nichols, Douglas J.; Norris, Richard D.; Pierazzo, Elisabetta ; Ravizza, Greg; Rebolledo-Vieyra, Mario; Uwe Reimold, Wolf; Robin, Eric ; Salge, Tobias; Speijer, Robert P.; Sweet, Arthur R.; Urrutia-Fucugauchi, Jaime; Vajda, Vivi; Whalen, Michael T.; Willumsen, Pi S.| title = The Chicxulub Asteroid Impact and Mass Extinction at the Cretaceous- Paleogene Boundary | journal = [[Science (journal)|Science]] | volume = '''327''' | issue = 5970 | pages = 1214–1218 | date = 5. mars 2010 | url = http://www.sciencemag.org/cgi/content/abstract/327/5970/1214 | doi = 10.1126/science.1177265  | accessdate = 2010-03-08 | pmid = 20203042}}</ref>

<ref name="Tilman ''et al.'' (2017)">Tilman, D., Clark, M., Williams, D. R., Kimmel, K., Polasky, S., & Packer, C. (2017). Future threats to biodiversity and pathways to their prevention. ''Nature'', '''546'''(7656), 73. doi:[https://doi.org/10.1038/nature22900 10.1038/nature22900]</ref>

<ref name="Wilcove (1989)">Wilcove, D. (1989) In memory of Martha and her kind. ''Audubon'' '''91''': 52–55.</ref>
</references>