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NASA GISS has been quite blatant in modifying the data even though they are aware that all the older versions exist in electronic archives. They have got away with it because no one in the major media or Congress seems interested in calling them on it.
To those outside of atmospheric science, I'm sure this seems incredible (as in "not credible"). It is, but this type of tweaking/fudging has been going on for quite some time.
In my global warming presentations, I have commented that it is quite possible that global warming is clearly a problem but the proponents have mucked up the data and the science so badly it is impossible to tell!