The argument, the best form of the argument, is the one that I made.Publically and in certain publications the climate science community tends to overstate its certainty. Privately, we know, they express uncertainties.
There are multilple causes cited in the post above volcanics,aerosols,solar( which by the way the recent minima was only unusual by its longevity not its amplitude) but we can leave Hansen 2011 to rebute your point 1
Since its emergence in the 1980s, the Antarctic ozone hole, the near-complete loss of lower-stratospheric ozone, has occurred every year. The possibility that a similar effect might occur in the Northern Hemisphere has been debated, but despite considerable variation in ozone levels in the Arctic, they had not reached the extremes seen in the south. Until this year. Observations made in the late winter and early spring of 2011 reveal ozone loss far outside the range previously observed over the Northern Hemisphere, comparable to some Antarctic ozone holes. The formation of the hole was driven by an unusually long cold snap and a high level of ozone-destroying chlorine. Although this effect is dramatic, it is difficult to predict whether similar Arctic ozone holes will develop in future.
Hart was well-regarded in both Britain and China. In addition to his baronetcy he was awarded the CMG, KCMG, and GCMG. China honoured him with several high status awards, including the title of grand guardian of the heir apparent, an honour never before (or after) bestowed on a foreigner.
The thing that struck me was that there were some callers who questioned the study or publicity because it sent the wrong message in that it provided fodder to those opposed to vaccines and the information may discourage people from getting the vaccine. He repeatedly said that telling the truth is the best thing that you can do. And that those who want to suppress the truth because the timing or the message might conflict with a desired outcome, are really a deterrent to real progress.This is an hour long program, and interesting, but the parts I am talking about happen at about 9 minutes to about 16 minutes and 39 minutes on.I wonder if anyone else hears a parallel to climate science here. If I know climate science some will hear it to support their own veiw. 153554b96e