http://advances.sciencemag.org/content/1/5/e1400253 Accelerated modern human–induced species losses: Entering the sixth mass extinction Gerardo Ceballos, Paul R. Ehrlich, Anthony D. Barnosky, Andrés García, Robert M. Pringle and Todd M. Palmer Science Advances 19 Jun 2015: Vol. 1, no. 5, e1400253 DOI: 10.1126/sciadv.1400253 This paper posits that we humans are in the midst of a current mass extinction, caused by human activity. This paper has already come under attack from a political point of view. Let's not do that. Please. My question is: can someone validate/invalidate the scientific merits of the claim? I am not able to do that.