Biodiversity science: mass extinctions

Body: 

Just because a question has been asked on mass extinction.  Worth looking at Barnosky, A. D., et al. (2011). "Has the Earth/'s sixth mass extinction already arrived?" Nature 471(7336): 51-57.  And Barnosky, A. D., et al. (2012). "Approaching a state shift in Earth/'s biosphere." Nature 486(7401): 52-58.

Themes: 
biodiversity loss
tipping points
planetary boundaries
Ecosystem services
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Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith