Biology / Bio 3523 · Atom · ~20 seconds

How Atmospheric Greenhouse-Gas Concentration Is Measured

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Greenhouse-gas concentration is tracked via direct-air sampling and ice-core records of trapped air.

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A polar ice core's trapped air bubbles let researchers measure composition from thousands of years before direct sampling began.

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Treating ice-core data as identical to direct-air sampling is the error: one infers past composition, the other measures present air.