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0.6 +/- 0.2°C warming observed during 20th Century

The Earth’s globally averaged surface temperature rose by approximately 1.08°F (0.6°C +/- 0.2°C) during the 20th century.

Source: IPPC Working Group I: The Scientific Basis (2001), Chapter 2

"The best estimate of global surface temperature change is a 0.6°C increase since the late 19th century with a 95% confidence interval of 0.4 to 0.8°C."

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0.6 +/- 0.2°C warming observed during 20th Century
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