But there are a lot of people who think CO2 absorbs IR to cause warming, without experimental demonstration of such significant effect.
It’s incredible that this kind of total crap is repeated forever.
There is an infinity od strong experimental evidence for the warming effect. It has been collected following same kind of methodes and approaches that are used in essentially all experimental physics. It’s so clear and extensive that it’s by now difficult to even say, where to start. Only thing that’s needed is a little basic understanding of physics and how empirical evidence is collected in physics.