Dr Roy Spencer has finally come off the fence regarding the Svensmark effect: the theory that solar modulation of galactic cosmic rays affects levels of cloud cover, and therefore insolation levels at Earth’s surface.
I fitted the trend lines to get an estimate of the relative magnitudes of these two sources of forcing: the cosmic ray (indirect) forcing is about 2.8 times that of the solar irradiance (direct) forcing. This means the total (direct + indirect) solar forcing on climate associated with the solar cycle could be 3.8 times that most mainstream climate scientists believe.
If this is anywhere close to being correct, it supports the claim that the sun has a much larger potential role (and therefore humans a smaller role) in climate change than what the “scientific consensus” states.
This is progress!