It’s really really hard to avoid laughing when adjustments come out of thin air but anyway…let’s consider HadCRUT4 less of a joke for a moment.
Since temperatures go up by including the upper Arctic, it is obvious that the rest of the world, and especially the inhabited regions, have not warmed as expected.
And a 5C increase in an area where the average is -20C is _not_ the same thing as a 5C increase where the average is +10C. The former is inconsequential, the latter a change in all seasons.
So HadCRUT4 simply confirms things are going as predicted only in faraway places where there are few measurements and nothing is really changing anyway.
If this doesn’t kill global warming, it certainly helps putting it in the right place.