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The titles indicate the baseline for each graph. e.g. "Global mean temperature difference from 1850-1900"

They are plotting the anomalies which tend to be much more useful for climate studies than the absolute values. e.g. [0,1]

[0] https://www.ncdc.noaa.gov/monitoring-references/dyk/anomalie...

[1] https://data.giss.nasa.gov/gistemp/faq/abs_temp.html

Right, so what is plotted is the deviation from the mean reading in the time range given? Thanks for the links, those are insightful.

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