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Hausfather and Chan et al. offer another correction of historical climate data and as always the correction is towards and yields a better fit with the prevailing orthodoxy. If there is a change of measurement producing or eliminating a bias offset, what we expect is a step in the plotted data. What we do not expect is a change from one essentially smooth and approximately linear curve to another with a different slope yielding a continuously rising difference. Of course you can construct hypothetical scenarios – a slow and rising uptake of the inferior measurement method – resulting in just that, but still, what I see here strongly smells of rat. More so, as they can plausibly explain the small and old difference in the Pacific but not the large and recent one in the Atlantic. And why are the data cut off in 1940 and we are not shown any more recent ones?
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