That’s a discussion in the back and forth comments to the article with the author.
The article itself does a convincing job of showing what’s wrong with the IPCC model. The 14CO2 decay data from the nuclear test pulse is particularly convincing.
However, the article seems to say, that since the model is wrong, and the human contribution is accounted for, there is either a rise in natural CO2, or the historical data is wrong.
Some of the posters to the article make the latter assertion, saying that ice cores may track atmospheric CO2, but they underestimate it.
Things to follow going forward.
I guess a logical question is, “How long have we been directly measuring atmospheric CO2, and how much of our data is inferred?”
My guess is the accurate measuring is only 20 years max and the rest is as you say, inferred........
As a side story, back around 2002 I spent the first night of a pheasant hunting trip to N.W. Kansas in an upstairs room of a 94 year old lady in Logan KS.
She was born and raised there and the house she lived in had been built by her father outside of town and she recalled how once a week they would take their horse and buggy into town to purchase supplies. The well they had at their house was drilled by her father using the method of the times, a drilling post pulled around and around by mule.
Eventually her father had the house moved into town by mule train, with the house being rolled on logs..........
The main street in town is so wide, that people park their vehicles in the middle of it. The reason it was so wide was because when the town was first founded, all the lumber was brought into town on mule trains and the street had to be so wide so as to allow them to turn around.
Anyway, this lovely woman was a literal history book of those times but what was most captivating was her account of living thru the great dust bowl of the 1930's......(There's still evidence out there of the old, abandoned small houses dotting the countryside of people who abandoned them and left)
The reason I bring up the dust bowl in this climate thread is that if you do a search on it, almost every article you find will classify it as the "Greatest man made climate catastrophe of all time"...........
Total BS! The catastrophe was caused by three years of drought and the farmer's inability to grow crops that would have helped to prevent soil erosion and dust storms..........
So the articles imply it was the fault of the farmers........