evidence: NASA did not create global warming by manipulating data [...] In the unscientific formulation of [some], this means that the adjustments for this effect make the past warmer and the recent temperatures colder. But overall, the estimated global warming actually becomes smaller when taking into account all the adjustments—the opposite of [that claim]. [See figure in Mark Richardson’s comment below.] [...] Raw data show more global warming since 1880 than is reported by NOAA [or shown in other datasets]. This is because NOAA "adjusts" temperature data to fairly compare different measurement times, places, and technologies. The cooling effect of adjustments on global temperatures has been shown lots of times, such as with the graph below for 1880—2013 temperatures.