Extinction Level Event (ELE)
Extinction Level Event (ELE) : "An extinction level event is a catastrophic occurrence which has the potential to terminate entire species of animals and plants: i.e., to cause a mass extinction. Such events are decidedly rare, but geological evidence shows that they have happened on many occasions since multicellular life became abundant on the planet almost a billion years ago". (BBC, Extinction Level Events, 1999)
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