ok.. let's look at Greenland.

Do you know why it's called Greenland? Because it used
to be green. The Vikings had colonies there when it was
fertile farmland.

Yes, farmland.

This was during the Medieval Warm period, something that
is (in)conveniently left out of my idiot cousin's little
mockumentary (I can't call it a documentary because it's
full of sh!t)