Well, that's what I get for relying on 35 year old high school social studies memories... thanks for the correction, Tom. Erik sounds like a scoundrel, but some parts of Greenland did seem to be reasonably green.

Viking Greenland history article

There are so many variables and uncertainties with the whole global warming issue - how much will he temperature change, what will that do to weather and where, will historical patterns be followed, etc, etc - that predictions seem almost useless. Around here, they can't even forecast the weather for tomorrow with much accuracy!

Makes one wonder about plans to terraform Mars... grandiose in the extreme, IMO.