Global mean temperature varied within a range of one degree Celsius during the Holocene.

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Facts: Global surface temperature rose about three-fourths of a degree Celsius in the 20th century.

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The result, says Dickinson, is a uniformity of temperature across all the samples being tested to within 0.1 degree Celsius.

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When the effects are calculated in a standard climate model, the result is a reduction in average temperature of 0.00005oC (one twenty-thousandth of a degree Celsius, or one ten-thousandth of a degree Fahrenheit).

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