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Reply to james bain two several years back CO2 is used being a refrigerant as the CFC / HCFC / HFC refrigerants are problematic to the ozone layer. CO2 is not.2 many years back Can we concur Co2 has aided green the World ? a lot more crops extra trees, more grass. more healthy soilReply to Palladini 2 a long time in the past It’s don't just t