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Even if so-called greenhouse gases were a climate problem, CO2 is only a very minor player compared to water vapour, and human-caused CO2 is only a small fraction of total atmospheric CO2. So what problem do we think we can solve?

Climate science is unsettling because past data are not fixed, but change later on.  I ran into this when I set out to update an analysis done in 2014 by Jeremy Shiers, which I discussed in a previous post reprinted at the end.  Jeremy provided a spreadsheet in his essay Murray Salby Showed CO2 Follows Temperature Now You Can Too posted in January 2014. I downloaded his spreadsheet intending to bring the analysis up to the present to see if the results hold up.  The two sources of data were:

Temperature anomalies from RSS here:  http://www.remss.com/missions/amsu

CO2 monthly levels from NOAA (Moana Loa): https://www.esrl.noaa.gov/gmd/ccgg/trends/data.html

Uploading the CO2 dataset showed that many numbers had changed (why?).

The blue line shows annual observed differences in monthly values year over year, e.g. June 2020 minus June 2019 etc.  The first 12 months (1979) provide the observed starting values from which differentials are calculated. …