This eye opening number corroborates that were in the midst of a planetary sixth mass extinction the previous five spread over a half billion years of geological time accrued from combined natural causes cataclysmic meteor strikes volcanism and atmospheric shifts the present episode has only one root cause homo sapiens. The sixth extinction an unnatural history is a 2014 non fiction book written by elizabeth kolbert and published by henry holt and company the book argues that the earth is in the midst of a modern man made sixth extinction. On five occasions in the past catastrophic natural events have caused mass extinctions on earth but today humans stand alone in dubious distinction among earths species homo sapienspossesses the ability to destroy entire species at will to trigger the sixth extinction in the history of life
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