SOURCES: World Resources Institute, the World Conservation Union, and the United Nations Environment Program, in consultation with the Food and Agriculture Organization and the United Nations Education, Scientific and Cultural Organization, Global Biodiversity Strategy (World Resources Institute, Washington, DC, 1992), p. 156. NOTE: The number of described species in 1992 is 1.4 million. The estimated number of described species in1997 is 1.7 million. Estimates of total species diversity range between 5 million and 100 million species. Most estimates fallbetween 30 million and 50million species.
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