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1999-02-05
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25.8.95
Earth 'is losing 74 species a day'
By Roger Highfield Science Editor
THE pace of extinction is now so great that a rapid survey of the creatures that have yet
to be named - the vast majority of living things - is required to find the most valuable
habitats and those at most risk.
The Bionet International Global Workshop, an international meeting of biologists from 50
countries, met yesterday in Cardiff to prepare a declaration on a global effort to chart the
Earth 's biological diversity.
Most of the populations of organisms, species and races of species disappear before scientists
can study them, in many cases before they can even give them a scientific name. Around 1.8
million species have been described by science, while estimates of the overall number of
species range from 10 million to 100 million, with 30 million a typical estimate.
Destruction of habitats by humans has escalated the extinction rate dramatically, said Prof
Michael Claridge, of Wales University, Cardiff College.
Using conservative estimates, the number of species doomed each year is 27,000, according to
Prof Edward Wilson, of Harvard University. "Each day it is 74 and each hour three," he said.
It has been predicted that one quarter of organisms could be extinct within 50 years.