>>509462111
I did "grasp" your post. Notice how this graph has a 1C jump in ~100 years around the 800s? There's plenty of examples of this. Were they industrialized in the 800s? What exactly is your answer for what caused this if not?

BTW you are relying on the "hockey stick" graph which was exposed as a deliberate fraud like a decade ago. What I posted here >>509461989 is an example of how off base models have been compared to actually measured global heating.