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Published daily in Bend, Oregon, by Western Communications, Inc. Copyright 2007.
By Carl Zimmer / The Bulletin
April 5, 2011
Over the past 540 million years, life on Earth has passed through five great mass extinctions. In each of those catastrophes, an estimated 75 percent or more of all species disappeared in a few million years or less.
For decades, scientists have warned that humans may be ushering in a sixth mass....
