Yes, Climate has been changing pretty regularly throughout time, and those that say that the present climate change is 100% human-caused are idiotic. But to say that Greenland was named Greenland because "oh, it has a bunch of grass! yahoo!" is just silly.
You can not just assume that the natural changes are going in the same direction as human made climate change. The opposite pattern with natural swings countering the effect of global warming is a possibility. It is a complex matter.
Greenland
was actually named Greenland because it had "a bunch of grass" - in the wide valleys of Southern Greenland. The grassing for sheep and cattle was far better than in barren Northern Iceland where Eric the Red and his men came from, so it was comparatively a green land.
Nuuk and the Icelandic capital Reykjavik (on the south coast of Iceland) are located equally north. The entire Southern Greenland is to the south of Iceland and the Norse sailed SW in search of better land. It was warmer back then, but the difference is getting smaller. It is one of the few areas of the world unequivocally benefitting from global warming with a rising agricultural sector. Sheep farming has already been big up there since the 1920s, but now cattle farming is starting up for the first time since the Norse died out. They are growing cabbage, potatoes, flowers etc. Greenland is a big place and the the southern tip is on the same latitude as Oslo and the Shetland Islands - no polar bears and sledge dogs down there.
Short documentary on the rise of the agricultural sector:
https://www.youtube.com/watch?v=CZQn4fbtsis
