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- #421
Because they are an imperfect measure of temperature, the difference between the ice age and gas age can be off by 1000 years or more, and they only provide records of local temperature and atmospheric concentrations of greenhouse gases. How does a global warming theory show a trend using records of local conditions and a measurement that doesn't show the relationship between temps and gas concentrations for a particular point in time?
The ice cores are used to measure gas concentrations not temperature. The main point being that none of the ice cores had CO2 as high as it is today, and the record goes back 600,000 years!