re: What kills civilization first?

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Climate change

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Pole shift

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What kills civilization cyclically?

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Something crashed into Earth and helped wipe out mammoths and other animals 13,000 years ago, study says

By Ashley Strickland, CNN Updated 1916 GMT (0316 HKT) October 29, 2019

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(CNN)Around 13,000 years ago, giant animals such as mastodons, mammoths, saber-toothed cats and ground sloths disappeared from the Earth. Scientists have found evidence in sediment cores to support a controversial theory that an asteroid or a comet slammed into Earth and helped lead to this extinction of ice age animals and cooling of the globe. It's called the Younger Dryas Impact Hypothesis and was first suggested in 2007. The hypothesis included the idea that an extraterrestrial body impacted Earth 12,800 years ago. This led to an extreme cooling of the environment, which in turn helped cause more than 35 species of large animals to go extinct.

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Other examples of excessive platinum grains have been found across Europe, western Asia, Chile, South Africa and North America. "We continue to find evidence and expand geographically," said Christopher Moore, study author and University of South Carolina archaeologist. "There have been numerous papers that have come out in the past couple of years with similar data from other sites that almost universally support the notion that there was an extraterrestrial impact or comet air burst that caused the Younger Dryas climate event." Moore has worked on previous research about the locations of different platinum spikes. These different spots around the globe have helped researchers piece together a global puzzle.

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"First, we thought it was a North American event, and then there was evidence in Europe and elsewhere that it was a Northern Hemisphere event. And now with the research in Chile and South Africa, it looks like it was probably a global event," Moore said.

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