I have questions about the temperatures during pre-industrial times. Were the thermometers used at that time calibrated? Are those thermometers available for inspection? What is the margin of error?
Excellent point.
And how accurate are the current methods and are they reliable and accurate? And how accurate the measurement techniques have to be?
I wonder about how accurate the data is and where it came from that they are basing their doom and gloom predictions on. Garbage in, garbage out.