'• NOAA’s recent (2015) scandal of manually adjusting temperature readings up which exaggerated “global warming.”'

There was no so-called scandal. John Bates, a disgruntled former NOAA employee and original source of this fake news, clarified that his beef had to do with data handling and management. He later walked back his statements concerning data integrity:

"Bates told the AP on Feb. 6 that there was “no data tampering, no data changing, nothing malicious” involved with his colleagues’ study. “It’s not trumped up data in any way shape or form,” he said."

You can read a full explanation here of the entire story and how NOAA's data adjustments were made to adjust for known errors between different temperature measuring methods and locations. And for the record, scientific research - regardless of the discipline - very frequently requires that data be adjusted prior to analysis. Not having to is the exception.

http://www.factcheck.org/2017/02/no-data-manipulation-at-noa