OVER 19,000 species of animal and plant are in danger of extinction, up from just over 11,000 in 2000, according to the latest "Red List of Threatened Species" from the International Union for Conservation of Nature (IUCN). Of those evaluated, nearly one-third are considered "threatened" (critically endangered, endangered or vulnerable). Between 2000 and 2011 the number of species assessed by the IUCN grew by over 60%. This goes part way towards explaining why some groups now appear strikingly more endangered than before
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