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The Dansgaard-Oeschger events recorded in Greenland ice are

  • A.large volcanic eruptions
  • B.changes in the solar output
  • C.abrupt warmings of several degrees
  • D.gradual warmings over ten thousand years

Answer: C

They demonstrate that the climate system can change very quickly indeed, which was a considerable surprise when first found. Changes in the Atlantic overturning are the leading explanation. Decades rather than millennia were involved.

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