Variation in solar activity during a recent sunspot cycle [credit: Wikipedia]
Dr. Scafetta offers a new analysis of the sun-climate issue, with fresh research. Clearly a crucially important topic in climate science, where certain pre-conceived ideas have dominated the discussion in recent years, to the point of refusing to even have one.
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Although the sun provides nearly all the energy needed to warm the planet, its contribution to climate change remains widely questioned, says Nicola Scafetta.
Many empirically based studies claim that it has a significant effect on climate, while others (often based on computer global climate simulations) claim that it has a small effect.
The Intergovernmental Panel on Climate Change (IPCC) supports the latter view and estimates that almost 100% of the observed warming of the Earth’s surface from 1850–1900 to 2020 was caused by man-made emissions. This is known as the anthropogenic global warming (AGWT) theory.
I addressed this important paradox in a new study published in Geoscience Frontiers.
The conundrum appears to arise from two sets of uncertainties: (i) the historical decades and long-term variations in solar activity are unknown; (ii) the sun may affect Earth’s climate through various physical mechanisms many of which are not fully understood and do not exist in the GCMs.
It is important to notice that the AGWT is based solely on computer simulations of global climate models (GCMs) that use total solar irradiance (TSI) records with very low multidecadal and long-term variability.
The same model also assumes that the sun affects the climate system only through radiative forcing such as TSI, although there is evidence that other solar processes may be related to solar magnetic activity (solar wind, cosmic rays, interplanetary dust, etc.) also affect the climate.
Continued here.
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Study: Nicola Scafetta: Empirical assessment of the role of the Sun in climate change using balanced multi-proxy solar records – Geoscience Frontiers (2023).
Tallbloke's Talkshop 
Reblogged this on Climate Collections.
My synopsis with excerpts and charts is at
It is difficult to get a man to understand something when his salary depends upon his not understanding it.
Upton Sinclair
https://www.brainyquote.com/quotes/upton_sinclair_138285
“My computer model says you have to change your reality.” <— the usual suspects with their PlayStation Climate 'Science'
when it comes to the “trust the science”,
“The Left doesn’t deny the science, they just stare at it, uncomprehending.”
Empirical assessment of the role of the Sun in climate change using balanced multi-proxy solar records (2023)
– Nicola Scafetta
Thus, at least about 80% of the solar influence on the climate could be generated by processes other than direct TSI forcing. If this result is correct, several solar-climate mechanisms must be thoroughly investigated and fully understood before reliable GCMs can be developed.
https://www.sciencedirect.com/science/article/pii/S1674987123001172?via%3Dihub#s0065