Did colliding space rocks change the climate for ancient humans?

Scientists recently found new evidence that an extraterrestrial collision 12,800 years ago may have triggered a period of abrupt climate change known as the Younger Dryas.

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The muck that’s been accumulating at the bottom of this lake for 20,000 years is like a climate time capsule. 
The muck that’s been accumulating at the bottom of this lake for 20,000 years is like a climate time capsule.

What kicked off the Earth’s rapid cooling 12,800 years ago?

In the space of just a couple of years, average temperatures abruptly dropped, resulting in temperatures as much as 14 degrees Fahrenheit cooler in some regions of the Northern Hemisphere. If a drop like that happened today, it would mean the average temperature of Miami Beach would quickly change to that of current Montreal, Canada. Layers of ice in Greenland show that this cool period in the Northern Hemisphere lasted about 1,400 years.

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