Should people eat broken glass? let's hear from both sides!
While CO2 promoters point out the fact that solar irradiance changes are relatively small over time, they ignore that those same irradiance changes correspond to changes in solar magnetism, which means changes in cosmic ray incidence on planetary atmospheres. It is well known that cosmic rays effect cloud formation.
It's really not as clear cut as you have been taught.
The solar constant in the past 400 years has varied less than 0.2 percent.
"It is well known that cosmic rays effect cloud formation."
Not well known, because the research is still ongoing. Henrik Svensmark's research in a dust- and impurity-free atmosphere contributed to our understanding of aerosol microphysics, but others agree that the effect in the real, present-day atmosphere is very tiny.
"Cosmic particles would be negligible compared with the background aerosol and the aerosol humans are adding by burning things, tilling soil, etc.”
"If clouds were affected by cosmic rays, they would have been affected a hundred times more strongly by human air pollution, and the world would have cooled over the past century, rather than warmed."
This work offers a new understanding of global particle
formation as based almost entirely on ternary rather than
binary nucleation, with ions playing a major but subdominant
role. Our results suggest that about 43% of cloud-forming
aerosol particles in the present-day atmosphere originate
from nucleation
This paper is part of the CERN CLOUD project (http://cloud.web.cern.ch/), an experiment trying to model our atmosphere to find out how much aerosols affect cloud formation and climate change.
The conclusion so far is that cosmic rays can charge aerosol particles, and produce big enough particles to contribute to cloud forming. This represents less than 10% (several per cent) of the total particle formation from nucleation, a major, but subdominant role. Nucleation (the creation of big enough particles) itself plays a 43% role, the rest is particles already in the atmosphere. So cosmic rays is less than 10% of 43%.
In any case if cosmic ray created aerosols would have such a large effect on clouds, so would other aerosols, such as those from air pollution.
Clouds themselves play a less than 10% role in climate change, so it's like 10% of the 10% (cosmic ray nucleation) of 43% (nucleation), as I said a tiny effect. Clouds also not just trap heat, but reflect sunlight back, cooling the planet.
As Ken Carslaw, one of the authors of the paper suggested: "It’s a tiny effect and previous studies suggest it will not be important". https://cosmosmagazine.com/climate/cosmic-ray-theory-of-glob...
Your repeated contention that pollution aerosols are of equal magnitude to cosmic rays contribution requires a large helping of evidence to back it up, given the huge quantity of cosmic rays that impact the troposphere.
Those are available at http://cloud.web.cern.ch/content/publications. The experiments are started back in 2009.
See Wikipedia for a simplified description of the results so far. https://en.wikipedia.org/wiki/CLOUD_experiment
Even if you think that cosmic rays are the bread and butter of cloud formation, the net effect would be global cooling. Clouds reflect more energy back into space than they do back to the ground.
I would also like to mention that this cosmic ray climate change denialism started with the media misreporting Henrik Svensmark's paper. The Daily Express itself said "Winter is coming: Exploding stars could lead to ICE AGE warn scientists" https://www.express.co.uk/news/science/894696/ice-age-weathe.... Most of the media attention was on the sensationalist claim that cosmic rays are causing climate change, from which the various Facebook people extrapolated cosmic rays = global warming. Just so you know, this is the original source of this claim. The paper itself is about aerosol microphysics, but that's not as exciting as "Giant EXPLODING stars FREEZING Earth".
https://arxiv.org/pdf/1812.02692.pdf
4 Conclusion
We have shown a strong correlation between solar and
tropospheric variability, in that swings from El Ni˜no
to La Ni˜na are related to the phase of the solar
cycle’s “fiducial clock,” and that that clock does not
run from the canonical solar minimum or maximum, but
instead resets when all old cycle flux is gone from the
solar disk. While the exact mechanism remains to be
elucidated, changes in cosmic ray flux appear to the be
the driver of these ENSO swings.
Finally, in the absence of sensitivity to solar-driven CRF
variations in current coupled climate models, we have a year
or so to wait to see if this indicator pans out. However,
should the coming terminator be followed by such an ENSO
swing then we must seriously consider the capability of
coupled global terrestrial modeling efforts to capture
“step-function” events, and assess how complex the Sun-Earth
connection is, with particular attention to the relationship
between incoming cosmic rays and clouds/ precipitation over
our oceans.They plan to establish causation by predicting ENSO changes based on solar activity, which is good. Once they do that, they will need to prove that cosmic rays are more important in cloud microphysics than the CERN CLOUD experiments suggests so far.
This is what real science is. Great find.