All they have to do is show me proof that hasn’t already been debunked.
You aren’t going to debunk it, because like it or not the fundamental reality is true...
Yes, CO2 is a mild greenhouse gas.. and yes, combustion, by humans is increasing its concentration in the atmosphere.
The fundamental theory, that more CO2 will cause more greenhouse effect is solid. This is very demonstrable, and repeatable.
The problem comes in when you attempt to quantify the effect... and when you do that, you don’t get the doom and gloom scenarios, or really anything close to them.
The reality is, there is indeed a threshold at which our atmosphere would indeed hit a runaway CO2 cascade effect and wind up like VENUS.. but the reality is, that level is so far beyond anything that we are looking at that its comical. We are not on the verge of some worldwide collapse of life because of CO2 emissions.
The problem is the chicken littles are flat out lying and overselling this, for political purposes... The science, real science, does not back up their hyperbole.