If historical data-based climate sensitivity estimates are unreliable, then how reliable is a critique based on historical data? Seems to me these authors have fallen into their own pit of questionable reliability. The same considerations they raise can (and should) be raised regarding their own work. Click here for more discussion on this paper.
“We speculate that this could be explained by a deficiency in simulated coupled atmosphere–ocean feedbacks which reinforce the pattern (resembling the Interdecadal Pacific Oscillation in some respects) that causes the low EffCS.” click here