The greenhouse effect and how CO2 affects it is actually quite complicated and not what happens in an actual greenhouse, and most of what happens that is releva

The greenhouse effect and how CO2 affects it is actually quite complicated and not what happens in an actual greenhouse, and most of what happens that is relevant to climate change actually happens in the upper atmosphere (which cools!). And there are other effects, like how CO2 get absorbed in the oceans, clouds, water vapor, etc... That CO2 has an effect on temperature is "easy" to realize, quantifying it is much, much harder. And I am just talking about short term effects, long term effects (including a potential tipping point) is yet another layer of complexity.