C02 makes dry ice, so how does it hold heat? It doesn't
https://www.ocregister.com/2012/01/27/james-moodey-co2-doesnt-rise-up-trap-and-retain-heat/
Does carbon dioxide trap and retain heat? No, although it cools more slowly than some other gases, it absorbs some amount of heat and quickly cools the same amount when the heat source is removed. Does it rise up in the atmosphere? No, it does the opposite.
The affect of carbon dioxide on the temperature of our atmosphere is fleeting and inconsequential. Note that during our most dramatic industrial growth from 1950 to 1980, our atmosphere cooled.