Has the Earth’s sixth mass extinction already arrived?

@article{Barnosky2011HasTE,
  title={Has the Earth’s sixth mass extinction already arrived?},
  author={Anthony D Barnosky and Nicholas J. Matzke and Susumu Tomiya and Guinevere O U Wogan and Brian Swartz and Tiago Bosisio Quental and Charles R. Marshall and Jenny L. McGuire and Emily L. Lindsey and Kaitlin C. Maguire and Benjamin D. Mersey and Elizabeth Anne Ferrer},
  journal={Nature},
  year={2011},
  volume={471},
  pages={51-57}
}
Palaeontologists characterize mass extinctions as times when the Earth loses more than three-quarters of its species in a geologically short interval, as has happened only five times in the past 540 million years or so. Biologists now suggest that a sixth mass extinction may be under way, given the known species losses over the past few centuries and millennia. Here we review how differences between fossil and modern data and the addition of recently available palaeontological information… 
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