[Deaf Smith]

"the disappearance of an entire culture from the Boreal forest region of Siberia between 7,000 and 6,000 BC."

The first Soviet Purge?

[Reeses]

Disappearance Of Ancient People

These "scientists" usually project their own kumbaya culture onto ancient people. The most likely reason they disappeared is either disease or war. Humans being killed off by climate change is very unlikely.