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Global mean surface temperature has risen by roughly how much since pre-industrial times?

  • A.about 3 degrees
  • B.about 1.1 degrees
  • C.about 5 degrees
  • D.about 0.1 degrees

Answer: B

Correct answer: about 1.1 degrees

Global mean surface temperature is roughly 1.1 to 1.2 degrees above the 1850–1900 baseline. The figure sounds small beside the day-to-day range at any one place, but it is a global annual mean - and the last glacial maximum, with ice sheets over northern Europe and North America, was only about 5 degrees colder than the pre-industrial state.

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