CO2 as a greenhouse gas is such a small part of the equation by itself. We need to include other forcings that drive climate, and for the most part they are left unmentioned. WHY? Earth has had much higher CO2 than it has now with massive glaciation. 

Nearly every day we hear about an effect that global warming has caused. Frequently we hear calls to criminalize anyone who dares challenge the claim. Anyone who says "but that doesn't make sense" is called a fool, idiot, denier, and worse. But the pretence that it's "undeniable" or "indisputable" is all we hear.