[Lucas McCain]

I wonder why it's called Greenland.

[BubbaBobTX]

During the time the Vikings were living there it in fact was a green land. But the planet cooled and the ice came back basically killing off the Viking colonies.

[chargers fan]

Vikings did that to try to convince people to move there when it was really just an ice covered land.

[JamesP81]

I wonder why it's called Greenland.

IIRC, that would be the doing of the Vikings. They called the snowy wasteland Greenland and they named the place with good arable land Iceland in order to throw off others that found out about both places, thus keeping unwanted visitors away from Iceland.