The Sixth Mass Extinction: fact, fiction or speculation?

  title={The Sixth Mass Extinction: fact, fiction or speculation?},
  author={Robert H. Cowie and Philippe Bouchet and Beno{\^i}t Fontaine},
  journal={Biological Reviews},
There have been five Mass Extinction events in the history of Earth's biodiversity, all caused by dramatic but natural phenomena. It has been claimed that the Sixth Mass Extinction may be underway, this time caused entirely by humans. Although considerable evidence indicates that there is a biodiversity crisis of increasing extinctions and plummeting abundances, some do not accept that this amounts to a Sixth Mass Extinction. Often, they use the IUCN Red List to support their stance, arguing… 
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