Science is not about the truth it is about what we can prove.
There is phenomenon that science can not explain or encompass yet, no doubt the phenomenon is real and tangible but it is out of our reach for now. AGW maybe true, it maybe false, though I hope you guys will agree that regardless of how good a theory sounds, it has to pass the same rigors of science as all other theories have to do to become accepted.
If AWG was scientific it would not be called AGW, it would merely be called something like CO2 theory, that is to say that CO2 is the primary driver of climate change. That is all you need, and that is a much more sharpened and on the point theory. If CO2 is the primary driver of climate, and if it can be shown that human beings produce the vast majority of CO2 (if true then this is not hard to prove at all) then AGW is an inescapable conclusion.
But AGW has none of these common sense rigours, it bypasses all scientific framework and goes directly to humans are causing climate change without any of the intermediate steps required to prove it.
AGW has no explanatory powers like regular scientific theories, it does not explain why the earth was both colder and hotter in the past and worse yet it does not even try to provide and explanation.
AGW does not involve scientific experimentation.
AGW purports that is has predictive power, now because AGW lacks explanatory power or scientific experimentation if AGW does have predictive power then it lives or dies based solely on that metric so it's predictive ability has to be earth shatteringly good for AGW to even begin to be taken seriously. The only predictive power AGW has is that the next AGW statistical model will be better than the last cluster f*ck of a AGW statistical model.