Agence France-Presse: Mankind may have unleashed the sixth known mass extinction in Earth's history, according to a paper released by the science journal Nature.
Over the past 540 million years, five mega-wipeouts of species have occurred through naturally-induced events.
But the new threat is man-made, inflicted by habitation loss, over-hunting, over-fishing, the spread of germs and viruses and introduced species, and by climate change caused by fossil-fuel greenhouse gases, says the study.
Evidence from fossils......
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World’s sixth mass extinction may be underway
Posted by Agence France-Presse: Richard Ingham and Laurent Bangue on March 4th, 2011
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