Red faces at NASA over climate-change blunder

I had heard this was a Y2K error, but this makes it sound like a "adjustment factor" error.
Adjustment factors are scary to me because while its easy to say "this data needs to be adjusted" it's hard to say how much. So you basically get to add a fudge factor that can be set to anything. Depending on the overall data set, the adjustment factor could be set to yield different conclusions.

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