You're not confusing CFCs destroying the ozone layer with the recent green house gas fiasco, are you?
The "study" was paid for by Dupont whose patent on r-12 was about to run out.
You have a copy of that patent? Or are you making stuff up?
I lived it.
I was family to some of the research people.
Family shares things, you know.
The patents were running out and China was set to be the major producer; R-12 was the best gas for the type of refrigeration we commonly use as its safety level is unequaled.
Dupont was a happy camper but the madness reigned and now the hole comes and goes, just as it has all along.
Its chief replacement, HFC-134 was just made a GHG by Jackson, Browner et al this year and here we go again.