Just looked at the links you posted more closely and it appears they all reference the same two studies.
Thought I'd post some alternative theories just for sake of science:
http://aeon.co/magazine/science/why-...t-the-problem/
http://hockeyschtick.blogspot.com/20...ixth-mass.html
http://www.climatedepot.com/2011/03/...es-can-evolve/
According to these and other studies, species are being discovered faster than they're dying off, etc.
Not endorsing any of these claims nor your own. Science is harder than news reports with quoted one-liners from much longer-winded research papers.