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Things to consider
Pre-1980, the record of how temps went on the entire continent of Antarctica are based on two thermometers, and the ocean numbers are almost guesses. 1980 should be the starting point for graphics like this -- that is when we started accurately measuring the whole thing.
The lower troposphere satellites say this was the 6th warmest year on record. "The record" is since we have been measuring temperature, not all time. It has been warmer on the planet but not recently.
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