Ok I'll go with it.
Say the long term health problems of smoking were to be refuted by the medical community tomorrow. But not the fact that its addictive.
How long before the tobacco industry starts using it money and political power to start marketing their product?
How long before the rules on where you can smoke start getting changed?
How long before someone can smoke in a restaurant again?
How long before "smok em if you got em" becomes a common phrase again?
My guess... less time than it took to make it how it is now.
Now replace tobacco industry with Industry in general, and smoking with Global warming.
If it turns out that we aren't responsible for that much of the global warming then much of the environmental progress that has been made will be in jeopardy. Keep in mind that even though you pointed out that due to the uncertanty that I admit in my calculation means that the IPCC figures could be correct, the opposite is equally true, I could be massivly over-estimating mankinds effect.
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