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Erwin says no. He thinks it’s junk science.
“Many of those making facile comparisons between the current situation and past mass extinctions don’t have a clue about the difference in the nature of the data, much less how truly awful the mass extinctions recorded in the marine fossil record actually were,” he wrote me in an email. . . .
“People who claim we’re in the sixth mass extinction don’t understand enough about mass extinctions to understand the logical flaw in their argument,” he said. “To a certain extent they’re claiming it as a way of frightening people into action, when in fact, if it’s actually true we’re in a sixth mass extinction, then there’s no point in conservation biology.”
This is because by the time a mass extinction starts, the world would already be over. . . .
“So you can ask, ‘Okay, well, how many geographically widespread, abundant, durably skeletonized marine taxa have gone extinct thus far?’ And the answer is, pretty close to zero,” Erwin pointed out. In fact, of the best-assessed groups of modern animals—like stony corals, amphibians, birds and mammals—somewhere between 0 and 1 percent of species have gone extinct in recent human history. . . .
Erwin’s argument is fallacious. He looks at the totality of the Permian extinction event, which took place over the course of 48 million years, and uses that to scoff at the extinction of a select group of animals within “recent human history” (whatever that means). Wrong. We don’t have the benefit of 48 million years of hindsight to compare the totality of impacts. What we can do is look at the rates of extinction and the Holocene rate of extinction is significantly greater than the Permian.