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This article

Species Extinction Happening 1,000 Times Faster Because of Humans?

makes an estimate of the rate of extinction now and 200,000 years ago. I know it's difficult but since there are estimates of rates of extinction 200,000 years ago, may be someone made an estimate somehow of how many species got extinct before humans. Is it possible to make an estimate of how many species extincted before humans?

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  • $\begingroup$ I heard rumours saying 98% $\endgroup$ – cell0 Apr 23 at 20:03

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