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Originally posted by Griff
How do they extrapolate temperature from an ice core?

There are numerous methods. Some involve concentrations of iostopes which change with temperature. Others include the depth of ice layers in different years. These are also duplicated in tree samples. Not just they growth of the rings, but also in the isotopes relationships found in many elements in the wood.

Interestingly is a benchmark for locating contaminated samples. Any CFCs indicates contaimination.