Then 11,000 years ago it suddenly returned to glacial conditions.

"I don't see them being able to make it in glacial conditions."

Compared to glacial conditions, habitable zones have expanded northwards, reaching their northernmost point during the hypsithermal.

But in going from interglacial to glacial conditions, changes in air temperature always occur first, followed by changes in atmospheric carbon dioxide.

But then Europe reverted to glacial conditions for about two centuries.

This cycle slowly shrank more south each time which lead to further retreat and further collapse of glacial conditions.

More than fourteen thousand years ago, the area experienced an intensely cold climate (but not glacial conditions).

In Europe, the glacial conditions around 300,000 to 400,000 years ago pressured H. heidelbergensis to evolve into Neanderthals.

Skaftafell strata display well the frequent shifts between glacial and inter-glacial conditions.

This pattern reflects the reemergence of a marked zonation of biomes with the decline of glacial conditions.