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There are examples of species all over the world that are "essentially the walking dead", said Stanford University professor Paul Ehrlich. "We are sawing off the limb that we are sitting on."
He was talking about the sixth mass extinction, the huge loss of species that is under way right now. It has been discussed in public before, of course, but what Ehrlich and other scientists have done is to document it statistically.
Animals and plants are always going extinct, usually to be replaced by rival species. But the normal turnover rate is quite slow, according to the fossil record. Ehrlich and his colleagues deliberately raised the bar, assuming that the normal rate is twice as high - and still got an alarming result.
In a study published this month in Science Advances, they report that vertebrates are going extinct at a rate 114 times faster than normal...