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2 WILSON, supra note 1, at 280.There have been approximately a dozen mass extinctions chronicled in the fossil record.See NEIL CAMPBELL, BIOLOGY, 500 (2d ed.1990).It typically has taken between 2 and 10 million years for the earth to rebuild its former diversity after major catastrophic extinctions.Homo sapiens are only about 250 thousand years old.For discussion, see Steven Jay Gould, The Golden Rule-A Proper Scale for our Environmental Crisis, NAT.HIST., Sept. 1990, at 24--30.3 1.4 million species have been identified worldwide and estimates of total global species diversity range from 5 to 100 million.See
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