It’s very simple. Because CO2 is denser than air it transfers heat more readily. IOW, when the sun isn’t shining CO2 radiates heat out of the atmosphere better than air.
Can’t wait for them to take a stand against the Greenhouse Effect. That’s the biggest fraud and the basis of the entire AGW scam.
Density adds to the greenhouse effect. If we didn't have N2 and O2 in our atmosphere the CO2 would be ineffective. The reason CO2 works as a greenhouse gas is that the heat captured by CO2 is immediately transferred to the rest of the atmosphere.
when the sun isn’t shining CO2 radiates heat out of the atmosphere better than air.
Yes it radiates heat. It also captures heat. In fact the amount it captures and the amount it radiates are identical (Kirchoff's Law or something like that). The radiation is in all directions, out to space, and back to earth. At night there is no incoming heat from the sun to be captured by CO2, only outgoing heat from earth.