The Sun has absolutely no affect on the Earth's climate!
-Al Gore
To the best of my knowledge, current climate models treat the sun’s output as a constant. However the variation in the sun’s output is greater than any other source of energy on the planet.
Wait. If it has different composition from the Sun how can watching it predict the Sun’s behavior?
The Sun’s gonna do what it does and there is nothing we can do about it. Even if they could predict an ice age no one would do anything about it in govt anyhow until it is too late.
Our Sun is a variable star, with its output varying by 0.1% over an 11 year cycle...NASA says so...
Plug that into the eccentricity of the Earth’s orbit around the Sun, the obliquity and precession of the Earth’s axis, the reasons our climate varies are easy to understand...
Milankovitch Cycles here:
https://www.skepticalscience.com/Milankovitch.html
Human activity possibly plays some small role, but it’s like a gnat on an elephant’s ass...The Sun is the moving force for our climate...
You are my sunshine, you are my sunshine.
Please don’t take my sunspots away!