FC is likely never going to get past his mistaken idea that scientific issues can be settled by consensus or polls. It is a fools errand to attempt to get him to think otherwise.
And yet, the only real look at it says otherwise. It's also irrelevant. There was no scientific consensus at the time. In fact the consensus in 1975 was that no prediction of the climate could be made at the time. It's much different today. Science has advanced in forty years. The consensus now is emphatic and nearly unanimous.
OK keep it in mind the next time 97 doctors tell you one thing and the other three tell you something else. Go with the three percent and let me know how it works out for you. Besides, I'm not relying on polls. I'm relying on common sense and knowledge of the basic irrefutable facts that CO2 is an important greenhouse gas and we have raised it's levels by 40%. Those are irrefutable facts. The rest is observation, logic and common sense.
The proper equivalent in 2015 would be 50% doctors tell you one thing and 50% tell you something else. 2015 will be the year that support for AGW falls below 50% in every survey of scientists. There is no escaping the truth as more information comes out and the earth enters year 19 without warming.
Your MD analogy, which is not a very good analogy by the way, explains why you are unable to understand why scientific questions can not be answered by consensus or polls. But as long as you want to go in that direction, for many years MD's believed that ulcers were caused by stress, eating capsaicin containing foods, aspirin, etc. The consensus was probably 80% or higher. This is because the the appearance of symptoms and their exacerbation was highly correlated with stress, heating hot peppers, ingesting aspirin etc. Then some Australian researchers reported that ulcers were very highly correlated with Helicobacter Pylori infections and could be cured with a combination of antibiotics. It took about a decade for the news to thoroughly sink in among the medical profession and the old consensus to dissipate. Now the new consensus is virtually 100% that H. Pylori is the cause of most ulcers. Consensus does not determine truth nor does it answer scientific questions. It is useless for those purposes. "The common wisdom [i.e. consensus] is almost always wrong." -- Gore Vidal
Like I said, it is not the consensus that makes AGW true, it's the facts....Jack. You keep wanting to go to your safe area about how invalid a consensus opinion is. But you are right about one thing, what you say about AGW is basically a waste of time.