Its "hard to believe" because it not true - solar spectral analysis is an old, old field as such things go.
It is true that since we have been making extra-atmospheric observations we are "fine tuning" our understanding, and some of the results are very interesting and even counter-intuitive - for example do a search on:
"Joanna Haigh" "An influence of solar spectral variations on radiative forcing of climate"
But none of this has substantially altered our understanding of short-term (centuries long) climate change.
It is impossible to understand short term, mid term or long term climate change on Earth without understanding all the physical interactions between the Sun and Earth. Absolutely impossible. So you do not know much about Climate Change right now. Which of course explains why almost all the warming predictions have been falsified. But hey, that is the difficult road to take. The road that causes lots of headaches. Some apparently prefer to just pretend to know everything.
If you are no longer being surprised by science, you are no longer doing science.
Missed this. Yes. The knowledge has been available to the Climate Change community for decades. Yet they continued to ignore serious investigations into the affects of non-visible light (electromagnetic radiation). That is either dumb or disingenuous. I know what the problem is. Dealt with it personally trying to educate the masses about another aspect of spectral qualities. Was like pounding a concrete wall with your fists. Took years to finally sink into the skulls full of mush. Now considered common knowledge in my field.