Fortunately, they were able to use to their SUVs, that were causing the climate to change, to escape.

a big shift to a much drier and colder climate, Tierney said.
Not very often that humidity and temperature have lately been mentioned in one sentence.

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Climate change causes everything, eh?
Nope but it often caused small early populations to move or perish. Climate change is a lot like death. There are always people dying naturally, but we still try to reduce human-caused deaths.

Perhaps the Toba supervolcanic eruption triggered this change.

A lot can happen during those 1,600 year intervals.