The thing that struck me most was that they barely tried to hide their blatantly improper corrections. No average trend, no questionable "rounding," just outright picking and choosing of which data to ignore, which to homogenize, and which to essentially change at will. Of course, an experienced researcher would catch it (no FOIA request for you!), but for the rest of us, well, "the science is settled!TM"
If I were in any scientific field I would be red hot about this. These arrogant fools have cast doubt on honest, hard work everywhere by the way they perverted the scientific method.