Before the debate about the meaning of a pile of numbers can begin:
1. Where are the scientific equipment calibration certification documents for each and every sensor used to derive said numbers over the time span of the collection sampling?
2. Are all the calibration certifications verifiable and not possible to be altered by any source once the certifications are sealed? Again, chain of custody.
3. For the data from these calibrated sensors, demonstrate the chain of custody that is unalterable from the sensor, its time and date, to the output final documents (charts, graphs, tables). The data must be verifiable as unchanged, accurate and true by any and all that investigate the data. This includes surprise inspections.
If workers are required to work under these condition inside a nuke plant (and they are) why should data that supposedly affects the entire Earth in one way or another not be held to the same scrutiny?
You are absolutely correct.
These measurements go back to the 1850s. Are you suggesting that the guys measuring the temperature in Siberia in the winter in 1875 were NOT calibrating their instruments to be accurate to within 0.1 deg? Are you suggesting we didn’t KNOW the daily temperatures in the Amazon rain forest with high precision in 1897?
Skeptic! Suggesting reputable scientists are taking measurements with a sledgehammer and reporting their results with a micrometer!