--So you're telling me that every single weather station in every state in the US is miscalibrated?
Miscalibrated for the use in question. They are most definitely taking the temperature of the environment around them, but until recently it was not realized how important that the change of the landscape around them would be when making calculations in the future.
Change the thermometer to a new type and the result changes.
Change the time you take readings and the end result changes.
Change the makeup of the box that holds the thermometer and the result changes.
Change the vegetation around the station and the result changes.
Put houses around the station and the result changes.
Put air conditioners around the station and the result changes.
Put highways, tarmac, and parking lots around the station and the result changes.
Shutdown a large number of rural stations and leave the urban stations and it skews averaged results.
The high temps of the dust bowl occurred when there was almost no large urban areas and no AGW.
That's what this paper is addressing. Not the current temperature outside.
The US South and Mid West also have some terrible climate swings over longer times that have dramatic effects on crops and populations.