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Olduvai III: Catacylsm
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How agriculture hastens species extinction

How agriculture hastens species extinction This week on 60 Minutes, correspondent Scott Pelley reports on something scientists are calling the sixth mass extinction. There have been five great die-offs in the history of our planet, when at least 75 percent of the known species disappear. The last mass extinction was 66 million years ago, when an asteroid […]

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Olduvai IV: Courage
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Olduvai II: Exodus
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