My obscure theory on the Younger-Dryas

Musk once noted how small a surface area is needed to run transportation if solar electric had a 15% end to end efficiency. That amount of surface area is a corner of Nevada, enough to significantly reduce CO2 levels, in a first order model.

It is entirely reasonable that some biological process would suddenly evolve that captured CO2 with that efficiency.  New plant species routinely take over regions of that size in paleo history.

If such a biological process suddenly bloomed just as the CO2 was rising, then the warming cycle is stopped, partial equilibrium reached in the glacial cycle and we are stuck at the holocene.

What biological process?  Early humans discover "no-till" farming.  They store up huge caches of seed, then at spring we have a human ritual of planting everywhere along the melting ice line.  A small farming community of a few hundred thousand in dispersed villages could easily seed a corner of Nevada.   Nature's existing seed dispersal patterns, would have never seen this efficiency, there would be no counter adaptation.

Pre-columbian agriculture:

Early inhabitants of the Americas developed agriculture, developing and breeding maize (corn) from ears 2–5 cm in length to the current size are familiar today. Potatoes, tomatoes, tomatillos (a husked green tomato), pumpkins, chili peppers, squash, beans, pineapple, sweet potatoes, the grains quinoa and amaranth, cocoa beans, vanilla, onion, peanuts, strawberries, raspberries, blueberries, blackberries, papaya, andavocados were among other plants grown by natives. Over two-thirds of all types of food crops grown worldwide are native to the Americas.^{[citation needed]}The natives began using fire in a widespread manner. Intentional burning of vegetation was taken up to mimic the effects of natural fires that tended to clear forest understories, thereby making travel easier and facilitating the growth of herbs and berry-producing plants that were important for both food and medicines. This created the Pre-Columbian savannas of North America.^[35]

So the globe is warming, each season new areas are opening up north and we get a Malthusian expansion.  Huge plains are flooded by the melting waters,   Humans crowding the ice line across the globe, throwing out seed on the muddy plain.