[T. P. Pole]

To reconstruct climate, scientists use natural archives, including tree rings, ice cores and laminated sediments. These natural records of temperature, precipitation and other environmental history have been carefully calibrated with instrumental observations, giving scientists quantitative information on past conditions at particular locations.

How about the archives that include the facts that people lived and grew crops in Iceland? Or is that too subjective?

[Kozak]

How about the archives that include the facts that people lived and grew crops in Iceland? Or is that too subjective?

People have been doing that for a long time, you mean Greenland. And you fell for the first great advertising ploy of all time....