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BlueFlannelJacket t1_ja7k8l3 wrote

Reply to comment by Goldenslicer in How is radioactive dating used to determine historical greenhouse gas levels and temperatures? by pog_irl

That's where the radioactive dating comes in. It uses the half life of known elements to measure how long ago that ice formed, and those 2 measurements together can be used to figure out the environment at a certain time.

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