Human 'Asteroid Collision'

The 6th great extinction event appears to be nothing like as dramatic as the asteroid collision that accounted for the dinosaurs (http://www.theguardian.com/environment/2014/dec/14/earth-faces-sixth-great-extinction-with-41-of-amphibians-set-to-go-the-way-of-the-dodo). It has been estimated that 41% of the world's amphibia plus substantial numbers of species of birds and mammals will soon be driven to extinction largely by human (anthropogenic) effects. The human desire for more and more 'agricultural land' (for biofuels as well as actual food), the 'need' for hydrochemicals and metals and our tendency to introduce (accidentally or deliberately) alien species into habitats across the world seem to be the cause of this looming mass extinction. That doesn't seem to be an especially good epitaph for our species?