Scientific American: Climate Change Linked to Social Collapses in Greenland Since 800 B.C.

A record written in algal fat reaffirms the role of climate change in determining the fate of Greenland's Vikings and other inhabitants

This is an interesting article to me to analyze and comment upon.  There may be a little of everything here for climate skeptics and climate believers.

For instance, for a climate skeptic, it confirms what has already been stated elsewhere.  That is, that there was a Medieval Warm Period, which has no explanation in current warming theory.  After all, how do you explain this warm period when there was little man-made carbon dioxide?  No industrial revolution, no man-made climate change.  It was warm enough on Greenland to support agriculture.

But then, the article swerves into climate change orthodoxy.

Of course, it is the burning of such oil that has led to this warming in the first place, thanks to increasing concentrations of atmospheric greenhouse gases. Already, those increasing concentrations of greenhouse gases are warming the planet's overall climate to the point that the meltdown of Greenland's ice sheet is speeding up, which could raise global sea levels a meter by 2100 at present rates, among other impacts.

No explanation for the warming in the past, but there's plenty of explanation for the warming in the present.  It is not because of natural forces, as it must have been in the past, it has to be man-made, or so goes the orthodoxy.


 h/t Al Fin