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Consider that the author particular choice placed the average at -.358 C, so moving the ZERO would increase theIt doesn't matter what baseline you choose. That's why you can choose it! Whatever baseline you choose makes no difference at all to the change in temperature over a particular interval, which is what we are interested in. No choice of baseline can "make his results look higher". This is really basic stuff. Frankly, I'm surprised that you still seem to be having difficulty grasping it.
entire range by .357 C including the top end, but the normal pre industrial baseline (1850-1900) is -.310C.
Cherry picking the baseline added .047 C to the warming total.
under the cherry picked baseline the total pre industrial warming in HadCRUT.4.6.0.0 would be
the difference between the baseline and the most recent year (2018), so .595 - (-.358)=.953C,
but the total warming with the 1850-1900 baseline would be .595 -(-.311)= .906C.
Let's not pretend that changing baselines is a simple DC offset.