Accelerated modern human-induced species losses: Entering the sixth mass extinction Ceballos, G. ; Ehrlich, P. R. ; Barnosky, A. D. ; Garcia, A. ; Pringle, R. M. ; Palmer, T. M. Abstract Publication: Science Advances Pub Date: June 2015 DOI: 10.1126/sciadv.1400253 Bibcode: 2015SciA....1E0253C