... and conservationists was made public: on a worldwide scale one in every 8 plant species is presently facing extinction. The United States is the statistical leader among nations that harbours whole strains of soon-to-be-obliterated plants. According to the World Conservation Union's Red List, nearly one in 3 plant species in the USA will soon no longer exist (of 16,108 species described). However, Dr. Pimm said he thought that the plight of plant life in the U.S. seems more grim than in other nations because those surveys made for the report were better conducted on American soil than elsewhere. Causes of extinction: There are several causes of extinction: loss of habitat; change in habitat quality; habitat fragmentation; persecution and exploitation of populations; and changes in the biotic environment (Global Biodiversity Assessment, 1995). Any loss of habit increases the risk of extinction of some species, so the loss of biodiversity cannot be minimised by ...

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