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...
Yes............
Especially when you consider that pic at the top, the entire Earth is the size of one of the small specs.................
That is what is so scary about life on earth. Forget all the hype about climate change, asteroid impact, nukes, or, girl scout cookies.
We know so little about how stars actually work, we don’t know when the Sun will start acting up.
We GUESS that it won’t become an unstable red giant in the far future, but, do we KNOW that?
Look at stars like Delta Scorpius. https://en.wikipedia.org/wiki/Delta_Scorpii.
If there was any life on a planet around that star, it was fried very quickly.