That is not what the data says, data from the Vikings and from this...
Greenland was once carpeted in lush forests, a new study shows.
www.livescience.com
"The oldest ever recovered DNA samples have been collected from under more than a mile of Greenland ice, and their analysis suggests the island was much warmer during the last Ice Age than previously thought.
The
DNA is proof that sometime between 450,000 and 800,000 years ago, much of Greenland was especially green and covered in a boreal forest that was home to alder, spruce and pine trees, as well as insects such as butterflies and beetles."
Greenland's ice age started at the top, as it got to within 600 or so miles of the North Pole, the annual snowfall ceased to fully melt, and it started to STACK...
When the Vikings arrived, the entire southern tip was Green, which is why they called it GREENland - DUH...
Now all of that is also frozen and buried under ice.
Greenland moved NW because of the slant of the fault at the bottom of the Atlantic (also through Iceland, the only point it is above sea level).
Greenland was totally green 1 million years ago, and NA was covered with mile plus thick ice down to Indiana....