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How do I know? ahhhh because it was named 'Green - land' and it was green, like as in green grass and supported a significant agricultural society, that was until it got too cold, because the whether changed, and we see today that Greenland is not so green anymore and its colder, colder than it has been in the past.
Erik the red discovered 'green-land' when he had been banished from Iceland for 3 years for murder, He named it Greenland to attract norse settlers. There is another theory that the names were switched to confuse any vikings from invading. Greenland was green when Erik the red discovered it.