I'm going to play devil's advocate here : The way to debate this with republicans is simple : global warming is being used to massively expand government and regulation. It effectively regulates one of the few things nothing and nobody can do without : energy. I don't think anyone really denies that that is happening.
Which is also why this responsibility thing is so huge with them : they don't feel responsible for global warming. Their grandfather's grandfather had nothing to do with it, other than having kids (ie. you). It's 15-20 generations back that it got started, long before accurate family records even began, and once started it was (and is) just a feedback loop that will complete with or without humans (look at the models in the IPCC reports, and ignore your "you averaged highdimensional non-linear models to arrive at a conclusion ?" impulse, which any statistician should have. And btw, that is not the only alarm that goes off in my head looking at those studies. I agree that those models are the best currently possible way to predict climate. Agreed. How does that fact make them valid ? Our best may simply not be good enough).
In no reasonable sense of the word is anyone, nor humans "as a whole" responsible for global warming and there is zero moral justification to force people to take global warming into account. Were some humans part of the initial cause of global warming ? Yes, very likely. All the pain the entirety of the west put itself through in the last 15 years, btw, have been worse than useless.
Ok, but maybe we can justify it by pointing out the success we've had by all that interference and government expansion, right ? Otherwise all the people hurt because of this goal, from people starving due to bio-ethanol idiocy to the masses of people fired from no-longer-profitable factories in the west were hurt merely to make intellectuals feel good about themselves, with no measurable advantage. The only measure of importance in the models is worldwide co2 concentration, which has worsened due to government interference (e.g. because factories in the US by large run on nuclear and oil, whereas the chinese factories replacing them run on coal, producing about 20x more co2 for the same amount of energy).
So have we improvided global co2 production ? Nope, we've actually worsened it.
And of course, like all failing political goals, total failure can only be responded to in one way : we must do it again ! More ! Harder ! Which of course, to these sceptics, and to anyone observing the situation proves that the only goal of politicians is not to do do anything about global warming, but to amass more power and hurt more people, make everyone more dependent.
The result, of course, will be a complete crash followed by wars. But of course, we won't know that for sure until it really happens, and then everyone can say "I didn't know". You just did what was popular, right ? How can popular thinking be wrong ?
We're on the titanic, slaughtering working people to satisfy the almighty atheismo on the front deck, them screaming and we celebrating, celebrating how he has delivered us from icebergs ... say, what's that in the distance ?