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Understanding Climategate's Hidden Decline
...First and foremost -- contrary to what you’ve likely read elsewhere in the blogosphere or heard from the few policymakers and pundits actually addressing the issue, it was not the temperature decline the planet has been experiencing since 1998 that Jones and friends conspired to hide. Certainly, the simple fact that the email was sent in November of 1999 should have allayed any such confusion.

In fact, the decline Jones so urgently sought to hide was not one of measured temperatures at all, but rather figures infinitely more important to climate alarmists – those determined by proxy reconstructions. As this scandal has attracted new readers to the subject, I ask climate savvy readers to indulge me while I briefly explain climate proxies, as they are an essential ingredient of this contemptible conspiracy. ...

...So not only did conspirators cherry-pick the one series of the four that approximated measured temperatures the longest, they also terminated that series at the point that it too, began to trend down. They then joined it to the actual 1980-1999 temperatures to “hide the decline” in the final product, as that decline created an inexplicable divergence between the reconstructed and measured temperatures. The existence of which challenges the entire series dating back to 1000 AD.

Remember, all of the temperatures prior to 1850 were estimated by computer algorithms and no actual readings exist to prove or disprove those figures. So a relatively short window of opportunity exists to test the programs against observations. Had 20th century measured temperatures continued to align with those recreated as smoothly after 1960 as they did previously, then the programmers could declare their code and hence their millennial temperatures sound. But the divergence, if allowed to stand, instead revealed serious design flaws in the proxy reconstructions. Which suggests that just as the decline was dealt with through trickery, so was the MWP. ...