The IPCC’s attribution methodology is fundamentally flawed

Reblogged from judithcurry.com

Posted on August 18, 2021 by curryja | 29 Comments

by Ross McKitrick

One day after the IPCC released the AR6 I published a paper in Climate Dynamics showing that their “Optimal Fingerprinting” methodology on which they have long relied for attributing climate change to greenhouse gases is seriously flawed and its results are unreliable and largely meaningless. Some of the errors would be obvious to anyone trained in regression analysis, and the fact that they went unnoticed for 20 years despite the method being so heavily used does not reflect well on climatology as an empirical discipline.

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