1) less active sun = more cosmic rays escape the sun
cosmic rays interact with water vapor in our atmosphere
2) cosmic ray interaction = more clouds in the sky.
clouds block light from the sun.
3) less light reaching the earths surface = less heat

CO2 has nothing to do with a warming climate.
it only serves as a reason for evil mad scientist to
earn an income , even if it kills us all.

https://www.youtube.com/watch?v=P022zR3DWMg

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3/4 inch of dust build up on the moon in 4.527 billion years,LOL and QM is fantasy science.