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"The Day the Earth Changed"—Unveiled by a Young 31-Kilometer-Wide Greenland Crater | The Daily Galaxy

“It’s much more extreme than I ever thought,” said UC Santa Barbara geology professor emeritus, James Kennett, about signs of a major cosmic impact that occurred toward the end of the Pleistocene epoch known as the Younger Dryas Impact Hypothesis, which postulates that a fragmented comet slammed into the Earth close to 12,800 years ago, causing rapid climatic changes, megafaunal extinctions, sudden human population decrease and cultural shifts and widespread wildfires.

“The more work that has been done, the more extreme it seems,” added Kennett. Little did Kennett and colleagues know just how far-reaching the projected climatic effect would be.

"The hypothesis suggests a possible triggering mechanism for the abrupt changes in climate at that time, in particular a rapid cooling in the Northern Hemisphere, called the Younger Dryas, amid a general global trend of natural warming and ice sheet melting evidenced by changes in the fossil and sediment record."

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