Redigerer Masseutryddelse (avsnitt)

== Referanser ==
<references>
<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="Hammarlund ''et al.'' (2012)">Hammarlund, E. U., Dahl, T. W., Harper, D. A., Bond, D. P., Nielsen, A. T., Bjerrum, C. J., ... & Canfield, D. E. (2012). A sulfidic driver for the end-Ordovician mass extinction. ''Earth and Planetary Science Letters'', '''331''', 128-139. https://doi.org/10.1016/j.epsl.2012.02.024</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="Nakrem (2018)">Nakrem, Hans. (2018, 8. januar). Utryddelse. I ''[[Store norske leksikon]]''. Hentet 8. juli 2018 fra https://snl.no/utryddelse.</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="Richter (2018)">Viviane Richter (2018) [https://cosmosmagazine.com/palaeontology/big-five-extinctions The big five mass extinctions] {{Wayback|url=https://cosmosmagazine.com/palaeontology/big-five-extinctions |date=20190517044503 }}. ''Cosmos, the science og everything''. Besøkt 2018-07-08</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>
</references>