[milwguy]

Actually 7000 years ago it was global cooling, because the glaciers were advancing. On the other hand, before they were advancing, that part of Canada was MUCH warmer than it is now, thus allowing the trees to grow. The evidence of forest growth in far northern reaches is proof that temperatures in the not too distant past were warmer than today, and as far as I know, the ice agers around then didn’t drive cars to hunt the mammoth and other game.
........As for being proof of global warming, ask why sea ice in antarctica was at RECORD levels this past summer (the southern hemispheres winter)? One could take that fact as evidence of global cooling.

[Vigilanteman]

You don't even have to go back 7000 years. A mere 850 years ago, circa 1150, the mini-ice age forced the vikings to abandon settlements in present day Greenland, Iceland and Newfoundland. They were growing grapes in those currently frigid regions at the time. Collectively, the westernmost of the settlements were known as Vinland.