“how those who got destroyed by the flood CAUSED this disaster....”
Through excessive use of campfires and slash and burn farming, obviously!
The final crash came when the people we call Neanderthals left en mass in their hydrazine (N2 H4) powered space ships. The heat those ship generated when they lifted off from the glacier tops was tremendous. You should have seen them - awesome!
Might want to cut back on the mushrooms, dude/dudette.