>>34675
The period he refers to is the period right before the 4.2 kiloyear event, so before 2200BC.
>A phase of intense aridity about 4.2 ka BP is recorded across North Africa,[4] the Middle East,[5] the Red Sea,[6] the Arabian peninsula,[7] the Indian subcontinent,[3] and midcontinental North America.[8] Glaciers throughout the mountain ranges of western Canada advanced at about this time.[9] Evidence has also been found in an Italian cave flowstone,[10] the Kilimanjaro Ice sheet,[11] and in Andean glacier ice.[12] The onset of the aridification in Mesopotamia about 4100 BP also coincided with a cooling event in the North Atlantic, known as Bond event 3.[1][13][14] Despite this, evidence for the 4.2 kyr event in northern Europe is ambiguous, suggesting the origin and impact of this event is spatially complex.[15]
But again,
>evidence for the 4.2 kyr event in northern Europe is ambiguous, suggesting the origin and impact of this event is spatially complex
it wasn't the same everywhere on Earth so that doesn't mean much.
>>34676
>northern mountain lion
if by "mountain lion" you mean "cougar", then no, those never lived in Europe. But it's a fact that before the Neolithic, there were lions living from Europe across Siberia to North America. Despite the very un-savanna environment of ice age Europe. They're also commonly present on cave paintings, and based on the depictions, they looked just like lions, except for having much less developed manes. But again, those lions went extinct by around 10k before present, and we know that from the fact that all fossil records disappear by then. They are part of the Pleistocene Extinction, likely caused by combination of sudden climate change and increasing hunting activity from growing human population.