One common claim of misinformed citizens or paid global warming disinformer trolls is that the temperature data on which climate science is based are rigged. Something many of the innocents are probably not aware of is that there are a number of data sets used by climate scientists and they all show basically the same thing (strange,… it looks like scientists know how to measure temperature).
If you want a little more on how NASA creates its widely referenced GISS (Goddard Institute for Space Studies) temperature record, check out this video:
For more info on the other datasets in the graph above, visit the following links to them: HADCRUT, (Hadley Climate Research Unit, UK), NCDC (National Climatic Data Center – part of NOAA), RSS (Remote Sensing Systems), or UAH (University of Alabama Huntsville)
via climate crocks
For a larger version of the graph above, visit skeptical science.