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Gearing Up For Change
By : aditya101 |
Members :4
Location : kanpur , India
Type : Public
Created on :
19 Apr 2011
Last Updated on :
31 Dec 2012 |
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Findfriendz / Clubs / Science and History / Gearing Up For Change
Gearing Up For Change
Over the past 540 million years, life on earth has passed through five great mass extinctions. In each of those catastrophes, an estimated 75 per cent or more of all species disappeared in a few million years or less. For decades, scientists have war ned that humans may be ushering in a sixth mass extinction, and recently a group of scientists at the University of California, Berkeley, tested the hypothesis. They applied new statistical methods to a new generation of fossil databases.
As they reported in the journal Nature, the current rate of extinctions is far above normal. If endangered species continue to disappear, we will indeed experience a sixth extinction, over just the next few centuries or millennia. The Berkeley scientists warn that their new study may actually grossly underestimate how many species could disappear.
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