We've repeatedly modeled this system of the solar photon spectrum impinging on the atmosphere as a function of constituents (and other things, ocean currents considered and solar variability included, etc.).
It's not a game where "scientists" playfully think about it and make a philosophical argument one way or the other. It's math TELLING us what the fuck is up.
So I guess I think CO2 does the greenhouse thing. And we've checked the ice record. Doesn't look good, never this much CO2 in recent history (almost all the way back to Adam and Eve!). And the air coming out of these how-many-hundred-millions of engines running every day has a lot of which molecule, guys? ...Am I missing something?
Don't hold your breath (burrrrn [another joke!]), but we might have One Last Hope. We could be entering another Maunder Minimum, I'd even settle for a Dalton. Anything helps, but the train has already left the station. The momentum is established.