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The IUCN Red List is set upon precise criteria to evaluate the Extinction risk of thousands of species and subspecies. These criteria are relevant to all species and all regions of the world. The aim is to convey the urgency of conservation issues to the public and policy makers, as well as help the international community to try to reduce species extinction. Established upon a strong scientific base, the IUCN Red List is often recognised as the most authoritative guide to the status of Biological Diversity . CURRENT RELEASE The latest update is the 2004 Red List, released on November 17 , 2004 . It evaluates 38,047 species as a whole, plus an additional 2,140 Subspecies , Varieties , aquatic Stocks , and Subpopulation s. From the species evaluated as a whole, 15,503 are considered Threatened . Of these, 7,180 are Animal s, 8,321 are Plant s, and two are Lichen . This release lists 784 species extinctions recorded since 1500 CE . This is an increase of 18 from the 766 listed as of 2000 . Each year a small number of 'extinct' species are either rediscovered or reclassified as 'data deficient'. In 2002 , the extinction list dropped to 759 species, but has been rising ever since. The 2006 IUCN Red List will be published on 4 May 2006 . CATEGORIES Species are classified in nine groups, set through criteria such as rate of decline, population size, area of geographic distribution, and degree of population and distribution fragmentation.
The older categories are loosely based on these. When discussing the IUCN Red List, the official term "threatened" is a grouping of three categories: Critically Endangered, Endangered, and Vulnerable. SEE ALSO EXTERNAL LINK REFERENCES
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