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Discussion

Air bubbles trapped in ice cores are valuable because they

  • A.show the annual layering clearly
  • B.contain traces of volcanic ash
  • C.preserve samples of ancient air
  • D.record the local temperature directly

Answer: C

They give a direct measurement of past carbon dioxide and methane concentrations rather than a proxy for them. This is what makes the ice core record so central to the greenhouse argument. Not a proxy but the gas itself.

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