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Link: http://www.rawstory.com/rs/2010/09/researchers-onefifth-earths-plants-threat/
More than a fifth of the world's plant species faces the threat of extinction, a trend with potentially catastrophic effects for life on Earth, according to research released on Wednesday. But a separate study cautioned that extinction of mammals had been overestimated and suggested some mammal species thought to have been wiped out may yet be rediscovered.