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According to data collected from ice cores being studied by Harvard University researchers working in Greenland, there may have been a large meteorite impact on Earth around 12,900 years ago. According to data collected from ice cores being studied by Harvard University researchers working in Greenland, there may have been a large meteorite impact on Earth around 12,900 years ago. The extinction of large mammals like mammoths, and the collapse of an ancient North American group known as the Clovis people has been blamed on a drastic climate change that occurred around the same time. It had been theorized that the change in climate along with wildfires were caused by a cosmic impact, but previous to the ice core samples no proof had been found.The ice core measurements show that 12,890 years ago there was a sudden increase – a spike of about 100 times - in the concentration of platinum. The after math from a meteorite striking the Earth and causing airborne debris may have created the rapid climate change and the discrepancy in how much platinum was found in the ice core sample. But no one has been able to find an impact crater to prove that a meteorite hitting the Earth caused the climate change.