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

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/anomalies-vs-temperature https://www.ncdc.noaa.gov/monitoring-references/dyk/anomalie... [1] https://data.giss.nasa.gov/gistemp/faq/abs_temp.html https://data.giss.nasa.gov/gistemp/faq/abs_temp.html