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Of the many species that have existed on earth - estimates run as high as fifty billion - more than ninety-nine per cent have disappeared. In the light of this, it is sometimes joked that all of life today amounts to little more than a rounding error.

Elizabeth Kolbert
Running, Errors, Light
"The Sixth Extinction?" by Elizabeth Kolbert, www.newyorker.com. May 25, 2009.
Of the many species that have existed on earth - estimates run as high as fifty billion - more than ninety-nine per cent have disappeared. In the light of this, it is sometimes joked that all of life today amounts to