Mass Extinctions

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IB ESS Video Podcast: http://sciencesauceonline.com/ibessblog • Subscribe to the ESS podcast on iTunes: https://itunes.apple.com/gb/podcast/i... • Twitter:   / science_sauce   • A mass extinction event is one where the number of organisms becoming extinct is noticeably higher than the background extinction rate (which is estimated to be around 1 species per million per year). There have been five recorded mass extinction events through known geological history. • Currently the number of organisms becoming extinct is significantly higher than background extinction rates and this is likely to be a consequence of human activities. Many people argue that we are currently in the midst of the sixth mass extinction.

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