> We compare the climatic effects of the CMIP6 solar forcing dataset to its CMIP5 predecessor by using time-slice experiments of two chemistry–climate models and a reference radiative transfer model... This solar-cycle response is slightly larger, but not statistically significantly different from that for the CMIP5 forcing dataset.
We may not know the exact values of cosmic ray, volcanic, etc. inputs into the systems, but we can make reasonable conclusions about their high and low end values and the likely impacts that result. A quick Googling will reveal plenty of research on (and mentions in IPCC reports) the things you assert are being ignored.
https://www.geosci-model-dev.net/10/2247/2017/
> We compare the climatic effects of the CMIP6 solar forcing dataset to its CMIP5 predecessor by using time-slice experiments of two chemistry–climate models and a reference radiative transfer model... This solar-cycle response is slightly larger, but not statistically significantly different from that for the CMIP5 forcing dataset.
We may not know the exact values of cosmic ray, volcanic, etc. inputs into the systems, but we can make reasonable conclusions about their high and low end values and the likely impacts that result. A quick Googling will reveal plenty of research on (and mentions in IPCC reports) the things you assert are being ignored.