NOAA released the first of 21 CCSP Synthesis and Assessment reports in May 2006, entitled "Temperature Trends in the Lower Atmosphere: Steps for Understanding and Reconciling Differences". The report identified and corrected errors in satellite temperature measurements and other temperature observations, which increased scientific confidence in the conclusion that lower atmosphere is warming on a global scale: "There is no longer a discrepancy in the rate of global average temperature increase for the surface compared with higher levels in the atmosphere," said the report, "the observed patterns of change over the past 50 years cannot be explained by natural processes alone". The report also said that "all current atmospheric data sets now show global-average warming that is similar to the surface warming. While these data are consistent with the results from climate models at the global scale, discrepancies in the tropics remain to be resolved."