The reviewers of Jared Diamond's book, Collapse, sustain a false image (mental model), without evidence, of the Norse in Greenland during the Little Ice Age. The evidence shows that the Norse in Greenland walked across the frozen Davis Strait to become ancestors of many tribes in America. Multiple evidence to support this statement is presented in
www.frozentrail.org.
For example: The Old Norse and the Algonquin-speaking people, one-third of North America, had over 15,000 phrases with similar sounds and meanings.
Historical documents on two continents record the Greenland migration story. Three Walam Olum verses describe how the Norse, using a republican government, made the decision to walk across the frozen sea.
The Norse in Greenland had a working mental model based on first hand knowledge of the evidence. It saved their lives. Survival, even today, requires a workable mental model supported by evidence