There is one other refrigerant which very nearly checks all the boxes, but with a surprising structure: trifluoromethyl iodide. While non-combustible, it has an

There is one other refrigerant which very nearly checks all the boxes, but with a surprising structure: trifluoromethyl iodide. While non-combustible, it has an extremely short atmospheric lifetime of less than one month, giving it a GWP about half that of CO2 (and used in much smaller quantities). https://en.wikipedia.org/wiki/Trifluoroiodomethane https://en.wikipedia.org/wiki/Trifluoroiodomethane https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=930076 https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=93007...