Many, many years ago while reading history books, watching documentaries and so forth, I learned that around twelve hundred years, ago global warming had allowed the Norse – commonly known as Vikings – to travel across near arctic regions and settle in places such as Iceland, Greenland and North America.
By the time of Columbus in 1492, global cooling had again taken place making it impossible for farming communities to survive in Greenland, and the route the Vikings used to get to North America being via Greenland, was no longer viable, therefore North America was effectively closed off to Europeans …
