Climate anomaly is an artifact

The time series of land and ocean temperature measurements, begun in 1860, shows a strange cooling of about 0.3 °C in the global mean temperature in 1945.  For more than 60 years, scientists have been at a loss to explain this anomaly.  Did the temperature really drop that year?  Apparently not. 

According to the team of US and British scientists who published their results in Nature, the bias was purely "instrumental..."

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