The peer-reviewed study at this link attempted to validate the current surface temperature datasets managed by NASA, NOAA and the UK’s Meteorological Office at Hadley, which is the UK National Weather Service.
“The conclusive findings of this research are that the three [Global Average Surface Temperature (GAST)] data sets are not a valid representation of reality. In fact, the magnitude of the historical data adjustments, that removed their cyclical temperature patterns, are totally inconsistent with published and credible U.S. and other temperature data. Thus, it is impossible to conclude from the three published GAST data sets that recent years have been the warmest ever despite current claims of record setting warming. Finally, since GAST data set validity is a necessary condition for EPA’s Greenhouse Gas/ CO2 Endangerment Finding, it too is invalidated by these research findings.”
~ Research conducted by 2 scientists and a statistician, and conclusions agreed by 7 other experts.