Technical Comments

Comment on “Can We Name Earth’s Species Before They Go Extinct?”

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Science  19 Jul 2013:
Vol. 341, Issue 6143, pp. 237
DOI: 10.1126/science.1237254

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Costello et al. (Review, 25 January 2013, p. 413) challenged the common view that many species are disappearing before being described. We suggest that their conclusion is overly optimistic because of a limited selection and interpretation of available evidence that tends to overestimate rates of species description and underestimate the number of species on Earth and their current extinction rate.

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