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USA Today: The Earth has undergone mass extinctions, during which more than 75% of existing species disappear, exactly five times in the past 540 million years. If things continue as they are we may be at the beginning of the sixth, a group of biologists and paleontologists suggest in a cautionary paper in Wednesday's edition of the journal Nature.
One possible cause of the largest extinction event in the history of life on Earth was a meteor that crashed off the coast of Australia about 251 million years......
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Study offers warning about next potential mass extinction
Posted by Washington Post: Juliet Eilperin on March 3rd, 2011
Posted in Water Conservation