Since our ancestors lived during the last major glaciation, do you think they were worried about the climate warming. They lived when glaciers were thousands of feet high. Think of the terror they felt when those glaciers starting melting from North America. I wonder if maybe one of the cave men, probably named "Al Goreyouwithmyclub" gave little skits about them all dying due to the glaciers crushing them or washing them away with the melt water? My guess, the other cave men awarded him the "No Bull Mastodon Award".
Here is a website which explains the last Ice Age in case you want to research your answer before posting.
http://www.museum.state.il.us/exhibits/ice_ages/
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