I'm on my way to bed, so I'll not be trying to explain anything tonight.
I would ask you two questions. Why is it that over 90% of climate scientists agree that man made climate change is an issue, and how/where were you directed to that Wiki article?
The article you reference specifically points out that before 1850 information is necessarily "reconstructed". After 1850..............
Bu I don't claim anything at this point, I took a very cursory glance.
Goodnight.