Chris Rentsch - not a climate scientist - has done an astounding calculation that, for some reason, Gavin Schmidt and climate "community" have failed to do. He's used absorption spectra over past 18 years to measure CO2 forcing. 
https://twitter.com/crentsch/status/1358122719305494529
2/ CO2 absorption spectra have long been used as evidence of existence of CO2 greenhouse effect, but measuring change in CO2 absorption spectra over time and on a global basis is a very non-trivial calculation. Rentsch has done it.
3/ even if there were no immediate implications for the overall debate, this would be an important and praiseworthy accomplishment. If the calculation showed that things were "worse than we thought", Rentsch would almost certainly been feted by scientific societies.
4/ however, his calculations indicate that measured CO2 forcing increase over past 18 years is about 60% of the forcing increase embedded in IPCC models.
5/ this would help explain why observed temperature increases have been at very lowest end of model projections.
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