During the Younger Dryas, forests were replaced by tundra vegetation even though many parts of the tropics and Southern Hemisphere became warmer and wetter.
Notes on verification
Multiple independent paleoclimate sources (ScienceDirect, Science.org/AAAS, PNAS, EBSCO) corroborate the bipolar seesaw pattern of Northern Hemisphere cooling/tundra expansion alongside Southern Hemisphere warming and wetting, though regional variability exists. [tier=gold indep_score=0.925 clusters=4 claim_tier=notable]
Sources
- Younger Dryas | Definition, Causes, & Termination (seed:history_and_archaeology)
- https://www.ebsco.com/research-starters/earth-and-atmospheric-sciences/younger-dryas (corroboration)
- https://www.sciencedirect.com/topics/earth-and-planetary-sciences/younger-dryas (corroboration)
- https://www.science.org/content/article/deep-freeze-didnt-affect-southern-hemisphere (corroboration)
- https://www.researchgate.net/publication/284868803_The_Younger_Dryas_Climate_Event (corroboration)