The “sly-entists” at CRU found that proxy temperatures took a downward trend after 1960. Other data was grafted onto the proxy data that gave the hockey-stick (trend upward) shape. This was deliberate and quite unethical. This article describes remarks within the computer code that indicate that this is indeed what was done:
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; Plots (1 at a time) yearly maps of calibrated (PCR-infilled or not) MXD
; reconstructions
; of growing season temperatures. Uses “corrected” MXD – but shouldn’t usually
; plot past 1960 because these will be artificially adjusted to look closer to
; the real temperatures.
We see the wolrd buying into the old fallacy that garbage is somehow ennobled by passing it through a computer. (I would say a million dollar machine rather than computer, but that is so last century.)