Around 12,800 to 12,900 years ago, a significant climate change event known as the Younger Dryas took place, following a gradual period of warming. This event is linked to evidence of a six-meter sea level rise, potentially caused by impacts on the North American and European ice caps. Impact proxies such as iridium, nano diamonds, platinum, and melt glass like trinitite have been found across a vast area of over 50 million square kilometers on Earth's surface. The hypothesis suggests that a comet fragment exploded in the sky, similar to the Tunguska event in 1908, possibly originating from the torrid meteor stream. However, there have been recent challenges to this hypothesis by Vance Halliday and his colleagues, questioning the Tunguska event's connection to impact proxies.

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