While there is still much conjecture about the causes of some mass extinctions, it is generally believed that they can occur when a biosphere under long-term stress is subjected to a short-term shock. In 1982, Jack Sepkoski and David M. Raup published a paper identifying five mass extinction events throughout Earth's history. Now a team of researchers claims that we are now entering a sixth mass extinction event, which threatens our very existence.
.. Continue Reading Researchers say Earth is entering a sixth mass extinction eventSection: Environment
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via http://www.gizmag.com/
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