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A comment on This year 'virtually certain' to be warmest in 125,000 years, EU scientists say. Parent comment

Re:This year 'virtually certain' to be warmest in 125,000 ye... by just_boost_it on Wednesday November 08, 2023 @09:14AM (#38190529)
In that link, it says ice cores track CO2. Temperatures were compiled from other geological records.
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Re:This year 'virtually certain' to be warmest in 125,000 ye... by wcoenen on Wednesday November 08, 2023 @09:40AM (#38190926)
Ice cores are one of the data sources used in temperature reconstruction. From the linked page:

By measuring the ratios of different water isotopes in polar ice cores, we can determine how temperature in Antarctica and Greenland has changed in the past.

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