The Earth isn’t a human that you can accurately take its temperature (let alone accurately take it over the last 100 years and claim a very small difference).
How can you claim accuracy given that the earth has tens of thousands of various temperature points that constantly change through the various seasons, subterranean effects, Earths orbit, Earth’s wobble, cosmic rays, the Sun’s orbit, etc?
Given all that, it seems ludicrous to claim a .85 C change in the last 100 years. The variables are too immense and well, variable
It’s like claiming you can grab a handful of air. Such claims normally indicate a vested interest which is based in money making. Oh wait.