Palaeontologists characterize mass extinctions as times when the Earth loses more than three-quarters of its species in a geologically short interval, as has happened only five times in the past 540 million years or so. Biologists now suggest that a sixth mass extinction may be under way, given the known species losses over the past few centuries and millennia.
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Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/has-earths-sixth-mass-extinction-already-arrived
[2] http://admin.indiaenvironmentportal.org.in/category/author/anthony-d-barnosky
[3] http://admin.indiaenvironmentportal.org.in/category/author/nicholas-matzke
[4] http://admin.indiaenvironmentportal.org.in/category/author/susumu-tomiya
[5] http://admin.indiaenvironmentportal.org.in/category/journal/nature
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/biodiversity
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/endangered-species
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/extinct-species
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/biodiversity-conservation
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/fossils
