[Vigilanteman]

I'm guessing they helped caused the last long era of global warming, though it could be just coincidental timing.

And, yes, the data shows that we did have an era of global warming from roughly 1978 to 1998, just as we had an era of global cooling from roughly 1941 to 1976.

[mlo]

"I'm guessing they helped caused the last long era of global warming, though it could be just coincidental timing."

The Vikings caused global warming?

Seriously though, the article didn't make any link between the events it discusses and the Vikings, or global warming. I think you are making unsupported leaps.