Around 12,900 years ago, the Northern Hemisphere plunged back toward near-glacial conditions during the Younger Dryas. Some regions experienced changes over decades, within a human lifetime. Ecosystems rearranged: grasslands contracted and forest belts shifted hundreds of kilometers. These shifts fragmented habitats and increased extinction pressure on megafauna. By the early Holocene, a majority of large mammal species over 44 kg had disappeared, with many losses around 13,000–10,000 years ago. The Clovis culture in North America disappeared during the broader late-Pleistocene megafaunal extinctions. Human populations were also disrupted by the same climate shock. The video argues that the scale of the climate shock better fits the extinction pattern than an explanation centred only on small human bands with stone points.
The video argues the Younger Dryas likely drove megafauna extinction
Key facts
- Around 12,900 years ago, the Northern Hemisphere plunged back toward near-glacial conditions during the Younger Dryas
- Some regions experienced changes over decades, within a human lifetime
- Ecosystems rearranged: grasslands contracted and forest belts shifted hundreds of kilometers
- These shifts fragmented habitats and increased extinction pressure on megafauna
- By the early Holocene, a majority of large mammal species over 44 kg had disappeared, with many losses around 13,000–10,000 years ago
- The Clovis culture in North America disappeared during the broader late-Pleistocene megafaunal extinctions
- Human populations were also disrupted by the same climate shock
- The video argues that the scale of the climate shock better fits the extinction pattern than an explanation centred only on small human bands with stone points
Sources
Younger Dryas - Wikipediaen.wikipedia.org
It is primarily known for the sudden or "abrupt" cooling in the Northern Hemisphere, when the North Atlantic Ocean cooled and annual air temperatures decreased.
[PDF] The Younger Dryasncei.noaa.gov
This near-glacial period is called the Younger Dryas, named after a flower (Dryas octopetala) that grows in cold conditions and that became common in Europe ...
Younger Dryas | Definition, Causes, & Termination - Britannicabritannica.com
Younger Dryas, cool period between roughly 12900 and 11600 years ago that disrupted the prevailing warming trend in the Northern Hemisphere ...
Past Global Warming More Rapid than Today's: The Younger Dryasscienceunderattack.com
One of the best documented is a period of climate upheaval known as the Younger Dryas, which occurred approximately 12,900 to 11,700 years ago ...
The Big Freeze: Rapid Cooling During the Younger Dryasscied.ucar.edu
It's also called the Big Freeze for obvious reasons. Why did climate cool during the Younger Dryas? Scientists are not entirely certain about the cause or ...
Younger Dryas - an overviewsciencedirect.com
The Northern Hemisphere cooled while the Southern Hemisphere warmed during the Younger Dryas, with greater changes toward the poles. The climate changes that ...
Volcanic forcing of global climate cooling at the Younger ...science.org
by L Nana Yobo · 2026 · Cited by 1 — The Younger Dryas (YD; ~12.9 to 11.7 thousand years) marks an abrupt return to near-glacial conditions during the last deglaciation, ...
Two examples of abrupt climate changeocp.ldeo.columbia.edu
An event that occurred about 12,800 years before present (BP), termed the Younger Dryas (YD), is the canonical example of abrupt climate change.
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