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The Younger Dryas (c. 12,900 to 11,700 years ago) was an abrupt return to glacial conditions in the Northern Hemisphere, interrupting the warming trend after the last Ice Age. It lasted over 1,000 years, causing severe cooling, advancing glaciers, and significant ecological changes, likely triggered by a massive influx of freshwater into the North Atlantic.

Key Aspects of the Younger Dryas:

Abrupt Cooling: Northern Hemisphere temperatures plummeted, with Greenland seeing drops of up to
$10 raised to the composed with power C$
(
$18 raised to the composed with power F$
) in a few decades, possibly within just a few years.
Cause: The leading scientific theory is that the rapid melting of the North American Laurentide ice sheet caused a massive release of fresh water, which disrupted the Atlantic thermohaline circulation
.

Environmental Impact: It brought dry, cold conditions to Europe and North America, marked by the reappearance of the arctic-alpine wildflower Dryas octopetala, from which it gets its name.

Human & Animal Impact: This period coincided with the extinction of Pleistocene megafauna (such as mammoths) and created a harsh environment for early human populations.

The Impact Hypothesis: Some scientists propose that a comet or asteroid impact caused the event, although this remains a highly debated and controversial topic, with many in the scientific community favoring the freshwater flooding theory.

Ending: It ended as rapidly as it began, roughly 11,700 years ago, leading into the present warm interglacial period, the Holocene.

The Younger Dryas serves as a critical example of how quickly the Earth's climate can shift, often acting as an analogue for future abrupt climate change studies.

Younger Dryas - Wikipedia
The Younger Dryas (YD, Greenland Stadial GS-1) was a period in Earth's geologic history that occurred circa 12,900 to 11,700 years...
Wikipedia
The Younger Dryas - National Centers for Environmental Information (NCEI)
The Younger Dryas occurred during the transition from the last glacial period into the present interglacial (the Holocene). During...
NOAA National Centers for Environmental Information (NCEI) (.gov)
Premature rejection in science: The case of the Younger Dryas Impact ...
The hypothesis proposes that the airburst or impact of a comet ∼12,850 years ago caused the ensuing ∼1200-year-long Younger Dryas ...
PubMed Central (PMC) (.gov)