Okay. I had read “Peace with God, Peace with All Creation” 22 years ago, and I just looked it up again now. Here is the part that you are concerned about (see
vatican.va/holy_father/john_paul_ii/messages/peace/documents/hf_jp-ii_mes_19891208_xxiii-world-day-for-peace_en.html):
The gradual depletion of the ozone layer and the related “greenhouse effect” has now reached crisis proportions as a consequence of industrial growth, massive urban concentrations and vastly increased energy needs. Industrial waste, the burning of fossil fuels, unrestricted deforestation, the use of certain types of herbicides, coolants and propellants: all of these are known to harm the atmosphere and environment. The resulting meteorological and atmospheric changes range from damage to health to the possible future submersion of low-lying lands.
I don’t have any trouble with this. Both problems – the ozone hole and the GH effect – came upon the public at about the same time. (And, yes, many people did confuse the two, and some still do.)
I suppose one could take this as JPII confusing the two, or that he was extremely sophicated (perhaps had his Vatican scientists look into his message before presenting it) and understood how the GH effect and stratospheric ozone depletion were related.
As I mentioned, CFCs & some other chemicals contribute to both. In fact, CFCs & co. are much more powerful GHGs than CO2. At the time they signed the Montreal Protocol, there was acknowledgement that it would not only help mitigate ozone depletion, but also global warming. Also the GH effect causes cooling in the stratosphere (above the GHG belt) by not allowing as much radiated warming out, and the cooler temps helping provide the necessary conditions for ozone breakdown. So in those two ways they are most certainly related. Here’s something that might help some people here understand the relationship: see
ratical.org/ratville/ozoneDepletion.html
The fact that JPII mentions “energy needs” and “burning of fossil fuels” and “unrestricted deforestation” indicates that he understands causes of anthropogenic global warming. The fact that he mentions “herbicides” and “coolants and propellants” indicates that he understands causes of stratopheric ozone breakdown (and the anthropogenically enhanced greenhouse effect). Also the fact that he mentions “meteorological changes” and “submersion of low-lying lands” indicates he undersands some of the impacts of AGW; the fact that he mentions “harm to human health” indicates he understands impacts of both AGW and stratospheric ozone depletion.
I have always interpreted that he had the more advanced knowledge and knew the two were related (but not the same thing), rather than he was confusing the two. Now in rereading it again, I’m sure he was not confusing the two.