Mass extinctions have happened periodically throughout Earth's history for a variety of different reasons, with the usual culprits being either asteroid hits or climate change. The Eocene extinction was originally thought to have been caused by climate induced issues, but recent evidence has suggested that the changes in the weather occurred due to a meteor strike, now believed to be the one that created the Popigai crater in Siberia. The resulting "impact winter" was caused by tiny particles blanketing the Earth and reflecting the sun's heat, creating a global temperature drop that wiped out most of the Earth's species.
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