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This radio broadcast discusses new clues as to what may have caused the biggest extinction in the history of Earth, the "Great Dying", which caused the disappearance of perhaps 90 percent of the life forms on Earth at the end of the Permian Period (250 Ma). Scientists theorize that this extinction, which was characterized by a long hot spell, poisoned oceans, and lack of oxygen in the atmosphere was caused by huge volcanoes spewing carbon dioxide, a big asteroid impact, or perhaps a combination of disastrous occurrences. The clip is 4 minutes and 40 seconds in length.
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