Why did the IPCC REMOVE Al Gores famous hockey stick temperature chart from their forth assessment report?
Technically it was Mann’s Hockey Stick and they removed it because they had to. It was a lie. It was a trial balloon – they floated it, skeptics popped it, and so they backtracked from “get rid of the MWP” to “downplay” the MWP as “regional” or “not geosynchronous” or an “anomaly” but not a “warm” period. Basically it’s still revisionist history but they’ve backtracked some. Problem is, even if you accept their present argument that the MWP peaked at about 1/3 deg. C below the late 20th century temps, that peak held for 200 years. If we didn’t trigger runaway warming then, then we’re not going to trigger runaway warming now. Even if you accept the part of their thesis that relates to the initial CO2-driven warming, there’s no catastrophe – there’s 1-2 deg C of warming over a few centuries, and that’s it. Their theory of material man-made warming relies on the idea of a positive feedback loop being triggered by the initial warming. If it’s been comparably warm for centuries on end, with
