Biodiversity and Human Health:
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Stuart L. Pimm, Gareth J. Russell, John L. Gittleman, and Thomas M. Brooks
Recent extinction rates are 100 to 1000 times their pre-human levels in well-known, but taxonomically diverse groups from widely different environments. If all species currently deemed "threatened" become extinct in the next century, then future extinction rates will be 10 times recent rates. Some threatened species will survive the century, but many species not now threatened will succumb. Regions rich in species found only within them (endemics) dominate the global patterns of extinction. Although new technology provides details of habitat losses, estimates of future extinctions are hampered by our limited knowledge of which areas are rich in endemics.
Science 21 July 1995:
Vol. 269. no. 5222, pp. 347 - 350