Because: 1. Mann claims tree-rings reliably show temperature for 1000 years. 2. McIntyre proves "hockey stick" graph wrong. 3. Osborn, Briffa, et. al. create "spaghetti charts" from corrected proxy data. 4. They overlay inst. data, erase divergence... "hockey stick proved!" https://twitter.com/ScottAdamsSays/status/1120686403434663936 …
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Replying to @ScottAdamsSays
You must be new to the discussion, then... I'll unpack it for you: 1. MBH 98/99 is a graph created by Michael Mann and popularized by Al Gore and the IPCC. It purported to show that current warming is "unprecedented in the last 1000 years," diminishing the importance of...pic.twitter.com/xcRBeqGV1r
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Replying to @NormanGYoung @ScottAdamsSays
...the medieval warm period in the popular imagination. One of the controversial hacked emails had Paul Overstreet (if I remember right) saying "we must get rid of the medieval warm period."
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Replying to @NormanGYoung @ScottAdamsSays
2. In 2003, McIntyre and McKitrick analyzed Mann's graph and found that his methodology would produce "hockey stick" graphs from mere noise. They also found many errors and discrepencies in his data.
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Replying to @NormanGYoung @ScottAdamsSays
3. In response to the criticism, Osborne, Briffa, and others (with close ties to Michael Mann) created what is known as the "spaghetti chart" which supposedly justifies Mann's earlier hockey stick graph. It does so by adding instrumental data on top of proxy data, and...pic.twitter.com/odckcMB0iI
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Replying to @NormanGYoung @ScottAdamsSays
...by cropping recent proxy data where tree ring data actually shows modern cooling.
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Replying to @NormanGYoung @ScottAdamsSays
4. This was touted as proof of the hockey-stick. "Hide the decline" is misguided if it is understood to mean that the IPCC was supposedly "hiding" a decrease in temps. That's not what happened. But the paleoclimate chapter WAS engaged in banana-republic levels of corruption.
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The topic is intent. I'm not arguing anything was accurate or inaccurate.
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Replying to @ScottAdamsSays
We KNOW that Mann's graph was inaccurate. The question is, was making Mann lead author, letting him promote his own work, making his team lead author after he's debunked, letting them promote their own work... ...was ALL of this, in the service to expunging the MWP, corruption?
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