The NOAA graph is typical of the UN, IPCC and other publicly funded agencies who are exaggerating the amount of global warming for funding and political purposes by producing charts that are misleading and disproportionate in scale.  Arguably, the most common form of misleading graphs is where the Y-axis is manipulated. When comparing similar data many try to exclude zero from the Y-axis in order to better show differences as is the case with the NOAA graph.

Zero Y access method shows no warming between 1931 to 1980

One of the simplest ways to mislead people, especially school children, about the results without actually interfering with the data is by distorting the scale of a graph to exaggerate or downplay change over time. Although the warming rates are similar the NOAA graph is designed in such a way that shows the warming rate is out of control but when you look closer it is less than what you would expect it to be within the margin of a sampling error or natural variability.

Warming Rate of only +0.76 C per century but it looks worse with the steep black line no zero Y axis.

The above graph was published by the WMO in its 2010 report.

Line graph above with similar decadal values shows no warming between 1931-1980 and only 0.27 C in the 100 years between 1880 and 1980. The first publication of global temperatures occurred in 1988 in the New York Times where NASA posted a temperature of 15.34 C! The 14.47 C temperature average for the decade ending in 2010 was increased from 14.40 C by about 0.07 C by Tom Karl of NOAA.